E.g.f.: Sum_{n>=0} (n+1) * (1 + x^n)^n * x^n/n!

Terms

a(0) =1a(1) =2a(2) =7a(3) =4a(4) =77a(5) =6a(6) =2527a(7) =8a(8) =33609a(9) =725770a(10) =907211a(11) =12a(12) =946028173a(13) =14a(14) =968647695a(15) =653837184016a(17) =18a(19) =20a(23) =24a(29) =30