A171203 G.f. satisfies: A(x) = (1 + x*A(2x))^4.

1, 4, 38, 708, 24961, 1682688, 220959136, 57266675520, 29497077110720, 30294634141775360, 62134850895148484608, 254691311135373319017472, 2087196424913845641682560512, 34202892422993270952623113994240

Offset

0,2

Links

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

Formula

Self-convolution 4th power of A171202 where a(n) = A171202(n+1)/2^n for n>=0.

Prog

(PARI) {a(n)=local(A=1+x+x*O(x^n)); for(i=0, n, A=(1+x*subst(A, x, 2*x))^4); polcoeff(A, n)}

Crossrefs

Cf. A135868, A171200, A171201, A171202, A171204-A171211.

Sequence in context: A177382 A201861 A171779 * A096332 A084284 A084285

Adjacent sequences: A171200 A171201 A171202 * A171204 A171205 A171206

Keyword

nonn

Author

Paul D. Hanna, Dec 05 2009

Status

approved