a(n) = Product_{i=1..n} i*rad(i) where rad(n) = A007947(n).

A277174

a(n) = Product_{i=1..n} i*rad(i) where rad(n) = A007947(n).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =36a(4) =288a(5) =7200a(6) =259200a(7) =12700800a(8) =203212800a(9) =5486745600a(10) =548674560000

External references