OFFSET
0,3
FORMULA
a(n) = A094557(2*n)/(n+1).
G.f. satisfies: A(x) = A(y) + x*A(x)*A(y)^2 + x^2*A(x)^2*A'(y) + x^3*A(x)^3*A(y)*A'(y) where y = x^2*A(x)^2. - Paul D. Hanna, Apr 17 2013
EXAMPLE
G.f.: A(x) = 1 + x + 3*x^2 + 10*x^3 + 42*x^4 + 180*x^5 + 825*x^6 +...
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, May 11 2004
STATUS
approved