Related to quintic factorial numbers A008548.

A034687

Related to quintic factorial numbers A008548.

Terms

    a(0) =1a(1) =15a(2) =275a(3) =5500a(4) =115500a(5) =2502500a(6) =55412500a(7) =1246781250a(8) =28398906250a(9) =653174843750

External references