A135869 G.f. A(x) = 1 + x*A(3x)^2.

1, 1, 6, 117, 6642, 1097874, 537135948, 784812995973, 3435153688724346, 45086429284345043334, 1775007791598340247784372, 209630197234751724563143145346, 74271350069687203431923556331222068

Offset

0,3

Comments

Self-convolution equals A135870.

Links

Table of n, a(n) for n=0..12.

Prog

(PARI) {a(n)=local(A=1+x+x*O(x^n)); for(i=0, n, A=1+x*subst(A, x, 3*x)^2); polcoeff(A, n)}

Crossrefs

Cf. A135867, A135870.

Sequence in context: A300733 A332627 A100070 * A218713 A360426 A054957

Adjacent sequences: A135866 A135867 A135868 * A135870 A135871 A135872

Keyword

nonn

Author

Paul D. Hanna, Dec 02 2007

Status

approved