A179904 - OEIS

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A179904

a(n) = A056520(n)+1 for n>0, a(0)=1.

1, 3, 7, 16, 32, 57, 93, 142, 206, 287, 387, 508, 652, 821, 1017, 1242, 1498, 1787, 2111, 2472, 2872, 3313, 3797, 4326, 4902, 5527, 6203, 6932, 7716, 8557, 9457, 10418, 11442, 12531, 13687, 14912, 16208, 17577, 19021, 20542, 22142, 23823, 25587

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

Original name: (1,3,5,7,9,..) = A005408 convolved with (1,0,2,3,4,..) = 1 followed by A087156.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..10000

Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1).

FORMULA

From Bruno Berselli, Aug 26 2011: (Start)

G.f.: (1 + x)*(1 - 2*x + 3*x^2 - x^3)/(1 - x)^4.

a(n) = (1/6)*(2*n^3 + 3*n^2 + n + 12) for n>0, a(0)=1. (End)