Greatest 6th-power-free divisor of n!.

Terms

a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =720a(6) =5040a(7) =630a(8) =5670a(9) =56700a(10) =623700a(11) =7484400a(12) =97297200a(13) =1362160800a(14) =28028000a(15) =7007000a(16) =119119000a(17) =2144142000a(18) =40738698000a(19) =12730843125a(20) =267347705625