Table read by rows: row n lists every number j whose n-th power has exactly j divisors.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =3a(5) =1a(6) =28a(7) =40a(8) =1a(9) =5a(10) =9a(11) =45a(12) =1a(13) =1a(14) =7a(15) =1a(16) =225a(17) =1a(18) =153a(19) =1a(20) =640a(21) =1a(22) =11a(23) =441a(24) =2541a(25) =4851a(26) =1a(27) =6348a(28) =1a(29) =13