G.f. satisfies: A(x) = (1 + x*A(x))^2 * (1 + 2*A(x)) / 3.
A231552
G.f. satisfies: A(x) = (1 + x*A(x))^2 * (1 + 2*A(x)) / 3.
Terms
- a(0) =1a(1) =6a(2) =63a(3) =822a(4) =12000a(5) =187632a(6) =3073047a(7) =52042038a(8) =903885102a(9) =16012472484a(10) =288207995934
External references
- oeis: A231552