A161740 Fourth right hand column of the RSEG2 triangle A161739

0, 30, 425, 3008, 14572, 55060, 174130, 481360, 1197196, 2733874, 5817955, 11668800, 22250280, 40616264, 71373956, 121292960, 200092040, 321439910, 504211037, 774042368, 1165242100, 1723107100, 2506711350, 3592233840

Offset

1,2

Links

Table of n, a(n) for n=1..24.

Formula

a(n) = (n+4)*(n+3)*(n+2)*(n+1)*(n)*(n-1)*(35*n^3+189*n^2+325*n+204)/45360

The denominator of a(n) (45360) equals the product of the first three terms of A036283 (6*60*126). - Johannes W. Meijer, Oct 22 2009

Crossrefs

Equals fourth right hand column of A161739 (RSEG2 triangle).

Other right hand columns are A000292, A107963, A161741.

Sequence in context: A097213 A110612 A290363 * A161623 A210431 A296919

Adjacent sequences: A161737 A161738 A161739 * A161741 A161742 A161743

Keyword

easy,nonn

Author

Johannes W. Meijer & Nico Baken (n.h.g.baken(AT)tudelft.nl), Jun 18 2009

Status

approved