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 = 4.
A113131
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 = 4.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =32a(4) =400a(5) =6784a(6) =144128a(7) =3658752a(8) =107686656a(9) =3599697920a(10) =134617038848
External references
- oeis: A113131