G.f.: A(x) = exp( Sum_{n>=1} (2^n - 1)^n * x^n/n ), a power series in x with integer coefficients.
A155202
G.f.: A(x) = exp( Sum_{n>=1} (2^n - 1)^n * x^n/n ), a power series in x with integer coefficients.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =119a(4) =12783a(5) =5739069a(6) =10426379903
External references
- oeis: A155202