E.g.f.: Sum_{n>=0} x^n * (1 + x^n)^n * exp(2*x^(n+1)) / n!.
A259202
E.g.f.: Sum_{n>=0} x^n * (1 + x^n)^n * exp(2*x^(n+1)) / n!.
Terms
- a(0) =1a(1) =3a(2) =7a(3) =21a(4) =89a(5) =393a(6) =2225a(7) =18609a(8) =101057a(9) =816993a(10) =13457825a(11) =51228609a(12) =810315137a(13) =17176207233a(14) =131372857985
External references
- oeis: A259202