A136593 Column 3 of triangle A136590.

1, 6, -25, -135, 1834, -3668, -110692, 1339020, -1181664, -164709864, 2206092096, 395662176, -463716547776, 7029335571840, 8900411569920, -2265668505227520, 38689597829053440, 92447263589921280, -17785648201625856000, 338957966532455424000

Offset

3,2

Links

Table of n, a(n) for n=3..22.

Formula

E.g.f.: A(x) = log(1 + x + x^2)^3 / 3!.

Example

E.g.f.: A(x) = 1*x^3/3! + 6*x^4/4! - 25*x^5/5! - 135*x^6/6! + 1834*x^7/7! -...

Prog

(PARI) a(n)=(n+3)!*polcoeff(log(1+x+x^2 +x*O(x^(n+3)))^3/3!, n+3)

Crossrefs

Cf. A136590, A136591, A136592, A136594.

Sequence in context: A188207 A275541 A082430 * A012293 A012594 A357089

Adjacent sequences: A136590 A136591 A136592 * A136594 A136595 A136596

Keyword

sign

Author

Paul D. Hanna, Jan 10 2008

Status

approved