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 A113596 P(P(n))-P(P(n-1)), where P(n) = n(n+1)(n+2)/6 (cf. A000292). 1
 0, 1, 19, 200, 1320, 6230, 23086, 71484, 192900, 467115, 1036585, 2140996, 4164524, 7698600, 13623260, 23210440, 38252856, 61222389, 95462175, 145416880, 216905920, 317444666, 456618954, 646518500, 902235100, 1242431775, 1689989301, 2272736844 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS FORMULA From Chai Wah Wu, May 28 2016 : (Start) a(n) = 9*a(n-1) - 36*a(n-2) + 84*a(n-3) - 126*a(n-4) + 126*a(n-5) - 84*a(n-6) + 36*a(n-7) - 9*a(n-8) + a(n-9) G.f.: x*(4*x^5 + 80*x^4 + 120*x^3 + 65*x^2 + 10*x + 1)/(1 - x)^9 (End) PROG (PARI) P(n) =  n*(n+1)*(n+2)/6; a(n) = P(P(n)) - P(P(n-1)); \\ Michel Marcus, Sep 16 2013 CROSSREFS Cf. A111400. Sequence in context: A241021 A055558 A160452 * A155670 A085770 A002501 Adjacent sequences:  A113593 A113594 A113595 * A113597 A113598 A113599 KEYWORD easy,nonn AUTHOR Amarnath Murthy, Nov 07 2005 EXTENSIONS Better description from Jonathan Vos Post, Nov 11 2005 Edited by N. J. A. Sloane, Nov 11, 2005 STATUS approved

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Last modified May 25 03:50 EDT 2019. Contains 323539 sequences. (Running on oeis4.)