OFFSET
0,3
EXAMPLE
G.f.: A(x) = 1 + x + 3*x^2 + 11*x^3 + 46*x^4 + 208*x^5 + 993*x^6 +...
where
A(x) = 1 + x*A(x)^2 + x^2*A(x)^3 + x^3*A(x)^5 + x^4*A(x)^7 +...+ x^n*A(x)^prime(n) +...
PROG
(PARI) {a(n)=local(A=1+x+x*O(x^n)); for(k=1, n, A=1+sum(j=1, n, x^j*(A+x*O(x^n))^prime(j))); polcoeff(A, n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Aug 04 2011
STATUS
approved