E.g.f.: Sum_{n>=0} x^n * (1 + x^n)^n * exp(4*x^(n+1)) / n!.
A259204
E.g.f.: Sum_{n>=0} x^n * (1 + x^n)^n * exp(4*x^(n+1)) / n!.
Terms
- a(0) =1a(1) =5a(2) =19a(3) =89a(4) =377a(5) =2225a(6) =10577a(7) =93665a(8) =663617a(9) =5100545a(10) =76194977a(11) =612260225a(12) =6223839617a(13) =118553476865
External references
- oeis: A259204