G.f.: Sum_{n>=0} (n+3)^n * x^n / (1 + (n+3)*x)^n.
A230056
G.f.: Sum_{n>=0} (n+3)^n * x^n / (1 + (n+3)*x)^n.
Terms
- a(0) =1a(1) =4a(2) =9a(3) =30a(4) =132a(5) =720a(6) =4680a(7) =35280a(8) =302400a(9) =2903040a(10) =30844800a(11) =359251200a(12) =4550515200a(13) =62270208000a(14) =915372057600
External references
- oeis: A230056