E.g.f.: A(x) = exp( Sum_{n>=1} 2^(n(n-1)/2) * x^n/n ).
A171777
E.g.f.: A(x) = exp( Sum_{n>=1} 2^(n(n-1)/2) * x^n/n ).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =23a(4) =473a(5) =27057a(6) =4102027a(7) =1539365191
External references
- oeis: A171777
A171777
E.g.f.: A(x) = exp( Sum_{n>=1} 2^(n(n-1)/2) * x^n/n ).