A135868 G.f. A(x) = (1 + x*A(2*x))^2.

1, 2, 9, 80, 1368, 45344, 2952208, 381005824, 97928967168, 50238812700672, 51495089926791168, 105513593089512439808, 432289346894817079853056, 3541746937174189008054386688, 58031524865557213409213540204544

Offset

0,2

Comments

Self-convolution of A135867 such that A135867(n+1) = 2^n*a(n).

Links

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

Prog

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

Crossrefs

Cf. A135867.

Sequence in context: A193208 A279055 A320946 * A212271 A147302 A301861

Adjacent sequences: A135865 A135866 A135867 * A135869 A135870 A135871

Keyword

nonn

Author

Paul D. Hanna, Dec 02 2007

Status

approved