OFFSET
0,2
COMMENTS
The g.f. of triangle A227372 satisfies: G(x,q) = 1 + x*G(q*x,q)*G(x,q)^2.
What is the generating function for this sequence?
EXAMPLE
G.f.: A(x) = 1 + x + 2*x^2 + 6*x^3 + 18*x^4 + 59*x^5 + 199*x^6 + 693*x^7 +...
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jul 10 2013
STATUS
approved