Number of perfect-power divisors of n!.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =3a(6) =7a(7) =7a(8) =11a(9) =18a(10) =36a(11) =36a(12) =47a(13) =47a(14) =84a(15) =122a(16) =166a(17) =166a(18) =221a(19) =221a(20) =346a(21) =416a(22) =717a(23) =717a(24) =1001a(25) =1360a(26) =2513a(27) =2942a(28) =4652a(29) =4652