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A048515 a(n) = T(n,n), array T given by A048505. 3
1, 5, 35, 160, 577, 1816, 5245, 14288, 37313, 94384, 232861, 563080, 1339249, 3141464, 7282493, 16711456, 38010625, 85786336, 192282301, 428342936, 948960881, 2091908680, 4590665245, 10032774640, 21843934657 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..2000

Index entries for linear recurrences with constant coefficients, signature (9,-33,63,-66,36,-8).

FORMULA

a(n) = (9*n^2 + n) * 2^(n-2) - n^2 + 1. - Ralf Stephan, Feb 05 2004

G.f.: -(8*x^5-43*x^4+53*x^3-23*x^2+4*x-1) / ((x-1)^3*(2*x-1)^3). - Colin Barker, Feb 25 2015

PROG

(MAGMA) [(9*n^2 + n) * 2^(n-2) - n^2 + 1: n in [0..30]]; // Vincenzo Librandi, Sep 26 2011

(PARI) Vec(-(8*x^5-43*x^4+53*x^3-23*x^2+4*x-1)/((x-1)^3*(2*x-1)^3) + O(x^100)) \\ Colin Barker, Feb 25 2015

CROSSREFS

Sequence in context: A097872 A184707 A124793 * A219973 A100739 A329762

Adjacent sequences:  A048512 A048513 A048514 * A048516 A048517 A048518

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified January 21 01:45 EST 2022. Contains 350473 sequences. (Running on oeis4.)