O.g.f.: Sum_{n>=0} n^n * (1+n*x)^(2*n) * x^n/n! * exp(-n*x*(1+n*x)^2).
A218677
O.g.f.: Sum_{n>=0} n^n * (1+n*x)^(2*n) * x^n/n! * exp(-n*x*(1+n*x)^2).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =14a(4) =79a(5) =516a(6) =3802a(7) =30668a(8) =268815a(9) =2522594a(10) =25201736a(11) =266014607a(12) =2953171684a(13) =34326755191a(14) =416313253084
External references
- oeis: A218677