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

0,1

Links

Table of n, a(n) for n=0..29.

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.

Crossrefs

Cf. A090453, A091026.

Sequence in context: A061550 A174385 A185129 * A240440 A256287 A047640

Adjacent sequences: A090451 A090452 A090453 * A090455 A090456 A090457

Keyword

nonn,easy

Author

Wolfdieter Lang, Dec 23 2003

Status

approved