a(0) = a(1) = 1, a(2) = x, a(3) = 2x^2, a(n) = x*(n-1)*a(n-1) + Sum_{j=2..n-2} (j-1)*a(j)*a(n-j), n>=4 and for x = 3.
A113130
a(0) = a(1) = 1, a(2) = x, a(3) = 2x^2, a(n) = x*(n-1)*a(n-1) + Sum_{j=2..n-2} (j-1)*a(j)*a(n-j), n>=4 and for x = 3.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =18a(4) =171a(5) =2214a(6) =35910a(7) =694980a(8) =15567795a(9) =395396478a(10) =11218141170a(11) =351527039676
External references
- oeis: A113130