E.g.f.: 1 + Sum_{n>=1} 2*exp(n^2*x) / 2^n.
A249940
E.g.f.: 1 + Sum_{n>=1} 2*exp(n^2*x) / 2^n.
Terms
- a(0) =3a(1) =12a(2) =300a(3) =18732a(4) =2183340a(5) =408990252a(6) =112366270380
External references
- oeis: A249940
A249940
E.g.f.: 1 + Sum_{n>=1} 2*exp(n^2*x) / 2^n.