Highly composite numbers of class 1 (see comment).

Terms

a(0) =3a(1) =8a(2) =16a(3) =18a(4) =30a(5) =72a(6) =144a(7) =168a(8) =252a(9) =336a(10) =420a(11) =900a(12) =960a(13) =1008a(14) =1080a(15) =1440a(16) =2160a(17) =2880a(18) =3360a(19) =6300a(20) =6720a(21) =7920a(22) =9240a(23) =12600a(24) =18480a(25) =30240a(26) =60480a(27) =65520a(28) =98280a(29) =131040