A090454 Fourth column (m=5) of array A090452.

15, 105, 396, 1110, 2600, 5390, 10220, 18096, 30345, 48675, 75240, 112710, 164346, 234080, 326600, 447440, 603075, 801021, 1049940, 1359750, 1741740, 2208690, 2774996, 3456800, 4272125, 5241015, 6385680, 7730646, 9302910, 11132100

Offset: 0

Author

Wolfdieter Lang, Dec 23 2003

Keywords

• nonn
• easy

Crossrefs

Cf. A090453, A091026.

Formula

a(n)= (n+9)*(n+6)*(n+2)*(n+1)*(n^2+15*n+20)/144,

G.f.: (15-24*x^2+18*x^3-4*x^4)/(1-x)^7.