a(n) = n!/lcm{1,2,...,n} = (n-1)!/lcm{C(n-1,0), C(n-1,1), ..., C(n-1,n-1)}.

A025527

a(n) = n!/lcm{1,2,...,n} = (n-1)!/lcm{C(n-1,0), C(n-1,1), ..., C(n-1,n-1)}.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =12a(6) =12a(7) =48a(8) =144a(9) =1440a(10) =1440a(11) =17280a(12) =17280a(13) =241920a(14) =3628800a(15) =29030400a(16) =29030400a(17) =522547200a(18) =522547200a(19) =10450944000a(20) =219469824000

External references