Largest squared factorial dividing n!.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =4a(6) =36a(7) =36a(8) =576a(9) =576a(10) =518400a(11) =518400a(12) =518400a(13) =518400a(14) =25401600a(15) =25401600a(16) =1625702400a(17) =1625702400a(18) =131681894400a(19) =131681894400