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A147722
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Row sums of Riordan array ((1-3x)/(1-4x+x^2), x(1-x)/(1-4x+x^2)).
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6
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1, 2, 8, 36, 164, 748, 3412, 15564, 70996, 323852, 1477268, 6738636, 30738644, 140215948, 639602452, 2917580364, 13308696916, 60708323852, 276924225428, 1263204479436, 5762173946324, 26284460772748, 119897955971092, 546920858309964, 2494808379607636, 11380200181418252
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OFFSET
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0,2
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COMMENTS
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Hankel transform of a(n) is [1,4,0,0,0,0,0,0,...]. [Philippe Deléham, Dec 03 2008]
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LINKS
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FORMULA
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G.f.: (1-3x)/(1-5x+2x^2).
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MATHEMATICA
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CoefficientList[Series[(1 - 3x)/(1 - 5x + 2x^2) , {x, 0, 21}], x] (* Indranil Ghosh, Mar 10 2017 *)
LinearRecurrence[{5, -2}, {1, 2}, 30] (* Harvey P. Dale, Aug 26 2021 *)
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PROG
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(PARI) Vec((1 - 3*x)/(1 - 5*x + 2*x^2) + O(x^22)) \\ Indranil Ghosh, Mar 10 2017
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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