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A091972
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G.f.: (1 + x^5 ) / ( (1-x^3)*(1-x^4)).
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1
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1, 0, 0, 1, 1, 1, 1, 1, 2, 2, 1, 2, 3, 2, 2, 3, 3, 3, 3, 3, 4, 4, 3, 4, 5, 4, 4, 5, 5, 5, 5, 5, 6, 6, 5, 6, 7, 6, 6, 7, 7, 7, 7, 7, 8, 8, 7, 8, 9, 8, 8, 9, 9, 9, 9, 9, 10, 10, 9, 10, 11, 10, 10, 11, 11, 11, 11, 11, 12, 12, 11, 12, 13, 12, 12, 13, 13, 13, 13, 13, 14, 14, 13, 14, 15, 14, 14, 15, 15, 15
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OFFSET
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0,9
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COMMENTS
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Poincaré series [or Poincare series] (or Molien series) for Mathieu group M_11.
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REFERENCES
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A. Adem and R. J. Milgram, Cohomology of Finite Groups, Springer-Verlag, 2nd. ed., 2004; p. 247.
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LINKS
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FORMULA
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a(0)=1, a(1)=0, a(2)=0, a(3)=1, a(4)=1, a(5)=1, a(n)=a(n-1)-a(n-2)+ 2*a(n-3)- a(n-4)+a(n-5)-a(n-6). - Harvey P. Dale, Dec 11 2012
G.f.: ( 1-x^3-x+x^2+x^4 ) / ( (x^2+1)*(1+x+x^2)*(x-1)^2 ). - R. J. Mathar, Sep 27 2014
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MATHEMATICA
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CoefficientList[Series[(1+x^5)/((1-x^3)(1-x^4)), {x, 0, 90}], x] (* or *) LinearRecurrence[{1, -1, 2, -1, 1, -1}, {1, 0, 0, 1, 1, 1}, 90] (* Harvey P. Dale, Dec 11 2012 *)
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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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STATUS
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approved
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