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 = 8.
A113135
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 = 8.
Terms
- a(0) =1a(1) =1a(2) =8a(3) =128a(4) =3136a(5) =103424a(6) =4270080a(7) =211107840a(8) =12135936000a(9) =794618298368
External references
- oeis: A113135