a(n) = A056622(n!).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =12a(6) =12a(7) =12a(8) =36a(9) =720a(10) =720a(11) =480a(12) =480a(13) =1680a(14) =3024a(15) =12096a(16) =12096a(17) =145152a(18) =145152a(19) =7257600a(20) =345600a(21) =1900800a(22) =1900800a(23) =136857600a(24) =684288000a(25) =4447872000a(26) =4447872000a(27) =435891456000a(28) =435891456000a(32) =190207180800