a(n) is the smallest positive integer divisible by exactly n nonpowers of 2.

Terms

a(0) =1a(1) =3a(2) =6a(3) =12a(4) =18a(5) =45a(6) =30a(7) =105a(8) =72a(9) =60a(10) =90a(11) =315a(12) =120a(13) =3645a(14) =210a(15) =180a(16) =450a(17) =1575a(18) =480a(19) =2835a(20) =360a(21) =420a(22) =630a(23) =3465a(24) =900a(25) =720a(26) =7290a(27) =1620a(28) =840a(29) =14175