a(n) = [x^(n-1)] Product_{k=1..n} (k + x + k*x^2), for n >= 1.
A322237
a(n) = [x^(n-1)] Product_{k=1..n} (k + x + k*x^2), for n >= 1.
Terms
- a(0) =1a(1) =3a(2) =24a(3) =160a(4) =1890a(5) =19866a(6) =313628a(7) =4521924a(8) =89489025a(9) =1642616195a(10) =39093550782a(11) =872184375426
External references
- oeis: A322237