O.g.f.: Sum_{n>=0} (n^2+n+1)^n * exp(-(n^2+n+1)*x) * x^n / n!.
A222523
O.g.f.: Sum_{n>=0} (n^2+n+1)^n * exp(-(n^2+n+1)*x) * x^n / n!.
Terms
- a(0) =1a(1) =2a(2) =16a(3) =208a(4) =3930a(5) =97956a(6) =3038968a(7) =112911296a(8) =4889301222a(9) =241822567180
External references
- oeis: A222523