a(n) = f(4*n+2)/(f(n-1)*f(n)*f(n+1)*f(n+2)), where f(k) = k!.

A248708

a(n) = f(4*n+2)/(f(n-1)*f(n)*f(n+1)*f(n+2)), where f(k) = k!.

Terms

    a(0) =60a(1) =12600a(2) =2522520a(3) =514594080a(4) =107550162720

External references