A281430 E.g.f.: C(x)^4 where C(x) is described by A281428.

1, 4, 104, 6880, 855680, 171673600, 50628300800, 20616410214400, 11081874771968000, 7600553402810368000, 6477130108444835840000, 6713789344917138964480000, 8317650472128427128258560000, 12137529532422860667092992000000

Offset

0,2

Links

Table of n, a(n) for n=0..13.

Example

C(x)^4 = 1 + 4*x^2/2! + 104*x^4/4! + 6880*x^6/6! + 855680*x^8/8! + 171673600*x^10/10! + 50628300800*x^12/12! + 20616410214400*x^14/14! + 11081874771968000*x^16/16! + 7600553402810368000*x^18/18! + 6477130108444835840000*x^20/20! + 6713789344917138964480000*x^22/22! + 8317650472128427128258560000*x^24/24! +...

Prog

(PARI) {a(n) = my(S=x, C=1); for(i=0, n, S = intformal( C^5 +x*O(x^(2*n))); C = 1 + intformal( S*C^4 ) ); (2*n)!*polcoeff(C^4, 2*n)}
for(n=0, 30, print1(a(n), ", "))

Crossrefs

Cf. A281428.

Sequence in context: A012984 A202683 A013114 * A354174 A158114 A082736

Adjacent sequences: A281427 A281428 A281429 * A281431 A281432 A281433

Keyword

nonn

Author

Paul D. Hanna, Feb 01 2017

Status

approved