a(0)=4; thereafter a(n)=8*n*(2*n-1)*a(n-1).

A257583

a(0)=4; thereafter a(n)=8*n*(2*n-1)*a(n-1).

Terms

    a(0) =4a(1) =32a(2) =1536a(3) =184320a(4) =41287680a(5) =14863564800

External references