G.f. satisfies A(x) = 1 + x*(2*A(x)^2 + A(x)^3).
A219535
G.f. satisfies A(x) = 1 + x*(2*A(x)^2 + A(x)^3).
Terms
- a(0) =1a(1) =3a(2) =21a(3) =192a(4) =2001a(5) =22539a(6) =267276a(7) =3287496a(8) =41556585a(9) =536565225a(10) =7046232285a(11) =93820316412
External references
- oeis: A219535