a(1) = 1, a(n) = a(n-1) times smallest divisor of n >= n^(1/2).

A072489

a(1) = 1, a(n) = a(n-1) times smallest divisor of n >= n^(1/2).

Terms

    a(0) =1a(1) =2a(2) =6a(3) =12a(4) =60a(5) =180a(6) =1260a(7) =5040a(8) =15120a(9) =75600a(10) =831600a(11) =3326400a(12) =43243200a(13) =302702400a(14) =1513512000a(15) =6054048000a(16) =102918816000a(17) =617512896000

External references