Quotient: squarefree kernel of A002944(n) divided by that of A001405.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =3a(7) =1a(8) =1a(9) =5a(10) =5a(11) =5a(12) =5a(13) =7a(14) =7a(15) =7a(16) =7a(17) =21a(18) =21a(19) =15a(20) =5a(21) =55a(22) =165a(23) =33a(24) =33a(25) =143a(26) =143a(27) =1001a(28) =1001a(29) =1001