G.f. satisfies A(x) = (1 + x*A(x)) * (1 + 2*x*A(x)^2).
A216314
G.f. satisfies A(x) = (1 + x*A(x)) * (1 + 2*x*A(x)^2).
Terms
- a(0) =1a(1) =3a(2) =17a(3) =121a(4) =965a(5) =8247a(6) =73841a(7) =683713a(8) =6493145a(9) =62898859a(10) =619079889a(11) =6173490857a(12) =62239144525a(13) =633323532783
External references
- oeis: A216314