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 A188696 G.f.: (1+x^2)/(1-26*x+x^2-26*x^3+2*x^4). 1
 1, 26, 676, 17576, 456974, 11881272, 308911722, 8031669672, 208822498874, 5429361243280, 141162775414434, 3670216121163384, 95425202122161082, 2481044412493313472, 64506872816303408306, 1677171363634329163848, 43606264885996836679850, 1133757932276682326501264, 29477577416016603603796450, 766413663428463660467554840 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..700 J. Noonan and D. Zeilberger, The Goulden-Jackson cluster method: extensions, applications and implementations Index entries for sequences related to linear recurrences with constant coefficients, signature (26,-1,26,-2). MATHEMATICA CoefficientList[Series[(1 + x^2)/(1 - 26*x + x^2 - 26*x^3 + 2*x^4), {x, 0, 30}], x] (* Vincenzo Librandi, Dec 09 2012 *) PROG (Maxima) makelist(coeff(taylor((1+x^2)/(1-26*x+x^2-26*x^3+2*x^4), x, 0, n), x, n), n, 0, 19);  [Bruno Berselli, Jun 05 2011] (PARI) Vec((1+x^2)/(1-26*x+x^2-26*x^3+2*x^4)+O(x^99)) \\ Charles R Greathouse IV, Jun 05, 2011 CROSSREFS Sequence in context: A206695 A171300 A188697 * A009970 A041313 A042302 Adjacent sequences:  A188693 A188694 A188695 * A188697 A188698 A188699 KEYWORD nonn,easy,changed AUTHOR N. J. A. Sloane, Apr 08 2011 STATUS approved

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