a(n) = polygorial(n,3)/polygorial(3,n), n >= 3.

A085356

a(n) = polygorial(n,3)/polygorial(3,n), n >= 3.

Terms

    a(0) =1a(1) =5a(2) =45a(3) =630a(4) =12600a(5) =340200a(6) =11907000a(7) =523908000a(8) =28291032000

External references