a(n) = (tau(n^13)+12)/13.

Terms

a(0) =1a(1) =2a(2) =2a(3) =3a(4) =2a(5) =16a(6) =2a(7) =4a(8) =3a(9) =16a(10) =2a(11) =30a(12) =2a(13) =16a(14) =16a(15) =5a(16) =2a(17) =30a(18) =2a(19) =30a(20) =16a(21) =16a(22) =2a(23) =44a(24) =3a(25) =16a(26) =4a(27) =30a(28) =2a(29) =212