OFFSET
0,3
EXAMPLE
G.f.: A(x) = 1 + x + 2*x^2 + 7*x^3 + 34*x^4 + 213*x^5 + 1691*x^6 +...
A(x) = 1 + x*A(x) + x^2*A(x)^4 + x^3*A(x)^12 + x^4*A(x)^32 +...
PROG
(PARI) {a(n)=local(A=1+x); for(m=1, n, A=sum(m=0, 16, x^m*(A+x*O(x^n))^(m*2^(m-1)))); polcoeff(A, n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jun 23 2010
STATUS
approved