G.f.: A(x) = exp( Sum_{n>=1} x^n/(1 - 2^n*x)^n / n ), a power series in x with integer coefficients.
A156171
G.f.: A(x) = exp( Sum_{n>=1} x^n/(1 - 2^n*x)^n / n ), a power series in x with integer coefficients.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =11a(4) =53a(5) =357a(6) =3521a(7) =51665a(8) =1122135a(9) =35638903a(10) =1639453459a(11) =108526044099
External references
- oeis: A156171