Cubefree products of primorials (A002110).

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =12a(5) =30a(6) =36a(7) =60a(8) =180a(9) =210a(10) =420a(11) =900a(12) =1260a(13) =2310a(14) =4620a(15) =6300a(16) =13860a(17) =30030a(18) =44100a(19) =60060a(20) =69300a(21) =180180a(22) =485100a(23) =510510a(24) =900900a(25) =1021020a(26) =3063060a(27) =5336100a(28) =6306300a(29) =9699690