a(n) = 0!*1!*2!*...*(n-1)! *(n^2)! *(n*(n-1))^2 / 2*n!*(n+1)!*...*(2*n-1)!
A181200
a(n) = 0!*1!*2!*...*(n-1)! *(n^2)! *(n*(n-1))^2 / 2*n!*(n+1)!*...*(2*n-1)!
Terms
- a(0) =0a(1) =4a(2) =756a(3) =1729728a(4) =140229804000
External references
- oeis: A181200