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

Author

Paul D. Hanna, Dec 02 2007

Keywords

• nonn

Crossrefs

Cf. A135866, A135863.

Programs

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)}