A135865 G.f. A(x) satisfies: A(x) = 1 + x*A(4x)^(1/2).

1, 1, 2, 14, 420, 52822, 26933340, 55104785932, 451307797531080, 14787550509729279590, 1938204238967340827449260, 1016173347424012723201485482596, 2131067935523127187022102005624003320

Offset

0,3

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, 4*x)^(1/2)); polcoeff(A, n)}

Crossrefs

Cf. A135866, A135863.

Sequence in context: A354465 A050561 A346082 * A337073 A306815 A358471

Adjacent sequences: A135862 A135863 A135864 * A135866 A135867 A135868

Keyword

nonn

Author

Paul D. Hanna, Dec 02 2007

Status

approved