G.f.: 1/(1-x) = Sum_{n>=0} a(n) * x^n / Product_{k=1..n} (1 + k*x)^2.
A208829
G.f.: 1/(1-x) = Sum_{n>=0} a(n) * x^n / Product_{k=1..n} (1 + k*x)^2.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =16a(4) =128a(5) =1396a(6) =19524a(7) =335676a(8) =6880388a(9) =164277924a(10) =4487230004a(11) =138213671308
External references
- oeis: A208829