Greatest 7th-power-free divisor of n!.

Terms

a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =720a(6) =5040a(7) =315a(8) =2835a(9) =28350a(10) =311850a(11) =3742200a(12) =48648600a(13) =681080400a(14) =10216206000a(15) =1277025750a(16) =21709437750a(17) =178678500a(18) =3394891500a(19) =67897830000