A112504 Fifth column of triangle A112500.

1, 35, 665, 9107, 100751, 957197, 8110087, 62854845, 453710670, 3091406010, 20086835910, 125465290530, 758173316850, 4455503465430, 25571494599330, 143839855533270, 795332428661055, 4333564250230845, 23317657891319095

Offset

0,2

Comments

For a combinatorial formula see A112500, case k=5.

Links

Table of n, a(n) for n=0..18.

Formula

G.f.: 1/product((1-j*x)^(6-j), j=1..5) = 1/(((1-x)^5)*((1-2*x)^4)*((1-3*x)^3)*((1-4*x)^2)*(1-5*x)).

a(n) computable from partial fraction decomposition of g.f. Cf. A112503.

Crossrefs

Sequence in context: A178353 A202127 A175774 * A140405 A367250 A278361

Adjacent sequences: A112501 A112502 A112503 * A112505 A112506 A112507

Keyword

nonn,easy

Author

Wolfdieter Lang, Oct 14 2005

Status

approved