G.f.: A(x) = 1+x + Sum_{n>=2} (A(x)^n - 1)^n.
A227619
G.f.: A(x) = 1+x + Sum_{n>=2} (A(x)^n - 1)^n.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =63a(4) =1278a(5) =29764a(6) =758065a(7) =20611793a(8) =590579518a(9) =17707907024a(10) =553879330720
External references
- oeis: A227619