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A127785
G.f. satisfies: A(x) = 1 + x*A(x+x^2)^3.
0
1, 1, 3, 15, 88, 594, 4404, 35260, 300918, 2714187, 25715364, 254752536, 2629587927, 28202629918, 313575278100, 3607684547463, 42880301468830, 525812475574788, 6643855672178904, 86407881067891029, 1155583581407910414
OFFSET
0,3
PROG
(PARI) {a(n)=local(A=1+x+x*O(x^n)); for(i=0, n, A=1+x*subst(A^3, x, x+x^2)); polcoeff(A, n)}
CROSSREFS
Sequence in context: A368972 A370472 A365128 * A287511 A231257 A074541
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jan 28 2007
STATUS
approved