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A014696
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Poincaré series [or Poincare series] (or Molien series) for mod 2 cohomology of universal W-group W(3).
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0
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1, 3, 14, 30, 77, 138, 273, 438, 748, 1113, 1729, 2436, 3542, 4788, 6630, 8676, 11571, 14751, 19096, 23826, 30107, 36894, 45695, 55146, 67158, 79989, 96019, 113064, 134044, 156264, 183260, 211752, 245973, 281979, 324786, 369702, 422617, 478002
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OFFSET
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0,2
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LINKS
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Index entries for linear recurrences with constant coefficients, signature (2,3,-8,-2,12,-2,-8,3,2,-1).
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FORMULA
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G.f.: (1+x+5x^2+x^3+x^4)/((1-x)^2*(1-x^2)^4). a(n)=-a(-6-n).
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MAPLE
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(x^4+x^3+5*x^2+x+1)/(x-1)^2/(-1+x^2)^4;
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MATHEMATICA
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LinearRecurrence[{2, 3, -8, -2, 12, -2, -8, 3, 2, -1}, {1, 3, 14, 30, 77, 138, 273, 438, 748, 1113}, 40] (* Harvey P. Dale, Sep 24 2017 *)
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PROG
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(PARI) a(n)=n+=3; n*((18*n^4-70*n^2+97)-(50*n^2-95)*(-1)^n)/3840
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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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Alejandro Adem (adem(AT)math.wisc.edu)
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STATUS
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approved
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