a(n) = [x^n] Product_{k=1..n} 1/(x^k*(1-x^k)^2).
A258791
a(n) = [x^n] Product_{k=1..n} 1/(x^k*(1-x^k)^2).
Terms
- a(0) =1a(1) =3a(2) =20a(3) =158a(4) =1307a(5) =11352a(6) =102538a(7) =954904a(8) =9112038a(9) =88723163a(10) =878714118a(11) =8829998320a(12) =89848944237a(13) =924291213496
External references
- oeis: A258791