a(n) = P_n(n) with P_0(z) = z+1 and P_n(z) = z + P_{n-1}(z)*(P_{n-1}(z)-z) for n>1.
A252730
a(n) = P_n(n) with P_0(z) = z+1 and P_n(z) = z + P_{n-1}(z)*(P_{n-1}(z)-z) for n>1.
Terms
- a(0) =1a(1) =3a(2) =17a(3) =871a(4) =4870849
External references
- oeis: A252730