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A003739
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Number of spanning trees in W_5 X P_n.
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3
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45, 55125, 59719680, 64416925125, 69471840376125, 74922901143552000, 80801651828175064605, 87141671714980415665125, 93979154798291442260459520, 101353134069755356151903203125
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OFFSET
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1,1
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REFERENCES
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F. Faase, On the number of specific spanning subgraphs of the graphs G X P_n, Ars Combin. 49 (1998), 129-154.
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LINKS
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FORMULA
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a(n) = 1152*a(n-1) - 80640*a(n-2) + 1442883*a(n-3) - 4477824*a(n-4) + 4477824*a(n-5) - 1442883*a(n-6) + 80640*a(n-7) - 1152*a(n-8) + a(n-9).
G.f.: 45*x*(1 +73*x -3456*x^2 +4534*x^3 +4534*x^4 -3456*x^5 +73*x^6 +x^7)/(1 -1152*x +80640*x^2 -1442883*x^3 +4477824*x^4 -447782*x^5 +1442883*x^6 -80640*x^7 +1152*x^8 -x^9).
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MAPLE
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seq(coeff(series(45*x*(1+73*x-3456*x^2+4534*x^3+4534*x^4-3456*x^5+73*x^6 +x^7)/(1-1152*x+80640*x^2-1442883*x^3+4477824*x^4-447782*x^5+1442883*x^6 -80640*x^7+1152*x^8-x^9), x, n+1), x, n), n = 1..20); # G. C. Greubel, Dec 25 2019
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MATHEMATICA
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Rest@CoefficientList[Series[45*x*(1 +73*x -3456*x^2 +4534*x^3 +4534*x^4 -3456*x^5 +73*x^6 +x^7)/(1 -1152*x +80640*x^2 -1442883*x^3 +4477824*x^4 -447782*x^5 +1442883*x^6 -80640*x^7 +1152*x^8 -x^9), {x, 0, 20}], x] (* G. C. Greubel, Dec 25 2019 *)
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PROG
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(PARI) my(x='x+O('x^20)); Vec(45*x*(1 +73*x -3456*x^2 +4534*x^3 +4534*x^4 -3456*x^5 +73*x^6 +x^7)/(1 -1152*x +80640*x^2 -1442883*x^3 +4477824*x^4 -447782*x^5 +1442883*x^6 -80640*x^7 +1152*x^8 -x^9)) \\ G. C. Greubel, Dec 25 2019
(Magma) R<x>:=PowerSeriesRing(Integers(), 20); Coefficients(R!( 45*x*(1 +73*x -3456*x^2 +4534*x^3 +4534*x^4 -3456*x^5 +73*x^6 +x^7)/(1 -1152*x +80640*x^2 -1442883*x^3 +4477824*x^4 -447782*x^5 +1442883*x^6 -80640*x^7 +1152*x^8 -x^9) )); // G. C. Greubel, Dec 25 2019
(Sage)
P.<x> = PowerSeriesRing(ZZ, prec)
return P( 45*x*(1 +73*x -3456*x^2 +4534*x^3 +4534*x^4 -3456*x^5 +73*x^6 +x^7)/(1 -1152*x +80640*x^2 -1442883*x^3 +4477824*x^4 -447782*x^5 +1442883*x^6 -80640*x^7 +1152*x^8 -x^9) ).list()
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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