G.f. satisfies A(x) = 1 + x * A(x)^2 * (1 + A(x) + A(x)^2).
A371657
G.f. satisfies A(x) = 1 + x * A(x)^2 * (1 + A(x) + A(x)^2).
Terms
- a(0) =1a(1) =3a(2) =27a(3) =333a(4) =4752a(5) =73764a(6) =1209492a(7) =20610693a(8) =361403937a(9) =6478386561a(10) =118181952369
External references
- oeis: A371657