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 A144942 Expansion of x^2*(3*x^3+145*x^2-507*x-25) / ((x-1)*(x^2-34*x+1)*(x^2+34*x+1)). 1
 0, 25, 532, 29237, 614312, 33739857, 708915900, 38935766125, 818088334672, 44931840368777, 944073229295972, 51851304849802917, 1089459688519217400, 59836360864832197825, 1257235536477947584012, 69051108586711506487517, 1450848719635862992732832 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Also the index of the first of two consecutive pentagonal numbers whose sum is also a pentagonal number. - Colin Barker, Dec 22 2014 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..200 Index entries for linear recurrences with constant coefficients, signature (1,1154,-1154,-1,1). MATHEMATICA CoefficientList[Series[x (3 x^3 + 145 x^2 - 507 x - 25)/((x - 1) (x^2 - 34 x + 1) (x^2 + 34 x + 1)), {x, 0, 20}], x] (* Vincenzo Librandi, Oct 20 2014 *) PROG (PARI) concat(0, Vec(x^2*(3*x^3+145*x^2-507*x-25)/((x-1)*(x^2-34*x+1)*(x^2+34*x+1)) + O(x^20))) \\ Colin Barker, Oct 20 2014 CROSSREFS Cf. A133301, A144796, A144797. Sequence in context: A028341 A282689 A282874 * A122140 A083191 A226299 Adjacent sequences: A144939 A144940 A144941 * A144943 A144944 A144945 KEYWORD easy,nonn AUTHOR Richard Choulet, Sep 26 2008 EXTENSIONS a(6) corrected, and more terms from Colin Barker, Oct 20 2014 Edited, name changed by Colin Barker, Oct 20 2014 STATUS approved

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Last modified December 6 12:26 EST 2022. Contains 358634 sequences. (Running on oeis4.)