G.f.: exp( Sum_{n>=1} 3 * Jacobsthal(n^2) * x^n/n ), where Jacobsthal(n) = A001045(n).
A211892
G.f.: exp( Sum_{n>=1} 3 * Jacobsthal(n^2) * x^n/n ), where Jacobsthal(n) = A001045(n).
Terms
- a(0) =1a(1) =3a(2) =12a(3) =198a(4) =16962a(5) =6762210a(6) =11473594848
External references
- oeis: A211892