G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (1+k*x)/(1-k*x).
A193110
G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (1+k*x)/(1-k*x).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =137a(6) =635a(7) =3233a(8) =17881a(9) =106489a(10) =678091a(11) =4590225a(12) =32873625a(13) =248056497a(14) =1965232403a(15) =16297012121a(16) =141080069057
External references
- oeis: A193110