Least product n*(n-1)*(n-2)*...*(n-k+1) divisible by (n-k)!.

Terms

a(0) =1a(1) =2a(2) =6a(3) =12a(4) =60a(5) =120a(6) =840a(7) =1680a(8) =15120a(9) =5040a(10) =55440a(11) =665280a(12) =8648640a(13) =17297280a(14) =259459200a(15) =518918400a(16) =8821612800a(17) =17643225600a(18) =335221286400a(19) =670442572800