O.g.f.: Sum_{n>=0} x^n * (n + x)^n / (1 + n*x)^n.
A230741
O.g.f.: Sum_{n>=0} x^n * (n + x)^n / (1 + n*x)^n.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =15a(4) =73a(5) =425a(6) =2908a(7) =22855a(8) =202849a(9) =2005929a(10) =21864076a(11) =260374631a(12) =3363097609a(13) =46823803585a(14) =699001981588
External references
- oeis: A230741