A218140 Central coefficients of triangle A181144.

1, 9, 419, 35052, 3932898, 525079969, 78585936821, 12747573200724, 2194994259274978, 395736626092691782, 73998168736285644408, 14252983638239681717320, 2813522889710891871593558, 566979470344349452319862891, 116289126161824019718614903183

Offset

0,2

Comments

The g.f. of triangle A181144 is exp( Sum_{n>=1} [Sum_{k=0..n} C(n,k)^4*y^k] * x^n/n ).

Links

Table of n, a(n) for n=0..14.

Prog

 (PARI) {a(n)=polcoeff(polcoeff(exp(sum(m=1, 2*n, sum(j=0, m, binomial(m, j)^4*y^j)*x^m/m)+O(x^(2*n+1))), 2*n, x), n, y)}
for(n=0, 20, print1(a(n), ", "))

Crossrefs

Cf. A181144.

Sequence in context: A179433 A091061 A024123 * A292073 A232249 A229843

Adjacent sequences: A218137 A218138 A218139 * A218141 A218142 A218143

Keyword

nonn

Author

Paul D. Hanna, Oct 21 2012

Status

approved