a(n) = (4*n-2)*((n-1)*a(n-1) + ((n-2)!)^2), with a(1) = 0, n > 1.
A302770
a(n) = (4*n-2)*((n-1)*a(n-1) + ((n-2)!)^2), with a(1) = 0, n > 1.
Terms
- a(0) =0a(1) =6a(2) =130a(3) =5516a(4) =397800a(5) =43770672a(6) =6828599232
External references
- oeis: A302770