G.f.: A(x) = exp( Sum_{n>=1} sigma_n(2n)*x^n/n ), where sigma_n(2n) is the sum of the n-th powers of the divisors of 2*n.
A156360
G.f.: A(x) = exp( Sum_{n>=1} sigma_n(2n)*x^n/n ), where sigma_n(2n) is the sum of the n-th powers of the divisors of 2*n.
Terms
- a(0) =1a(1) =3a(2) =15a(3) =120a(4) =1450a(5) =25383a(6) =591563a(7) =17156364a(8) =595635903a(9) =24023004840
External references
- oeis: A156360