G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (k - x) / (1 - k*x).
A231172
G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (k - x) / (1 - k*x).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =9a(4) =55a(5) =412a(6) =3665a(7) =37809a(8) =443998a(9) =5848921a(10) =85425959a(11) =1370144160a(12) =23941364521a(13) =452710417321
External references
- oeis: A231172