a(n+1) = floor(a(n)/2) * ceiling(a(n)/2), a(0) = 5.

A014980

a(n+1) = floor(a(n)/2) * ceiling(a(n)/2), a(0) = 5.

Terms

    a(0) =5a(1) =6a(2) =9a(3) =20a(4) =100a(5) =2500a(6) =1562500a(7) =610351562500

External references