a(n) = [x^n] 1/Product_{k=0..n-1} (1 - k*x)^2.
A383880
a(n) = [x^n] 1/Product_{k=0..n-1} (1 - k*x)^2.
Terms
- a(0) =1a(1) =0a(2) =3a(3) =72a(4) =2307a(5) =95060a(6) =4817990a(7) =290523576a(8) =20333487251
External references
- oeis: A383880
A383880
a(n) = [x^n] 1/Product_{k=0..n-1} (1 - k*x)^2.