a(0) = 1, a(n) = spf(n)*a(n-spf(n)), where spf=A020639 (smallest prime factor).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =8a(7) =7a(8) =16a(9) =24a(10) =32a(11) =11a(12) =64a(13) =13a(14) =128a(15) =192a(16) =256a(17) =17a(18) =512a(19) =19a(20) =1024a(21) =1536a(22) =2048a(23) =23a(24) =4096a(25) =5120a(26) =8192a(27) =12288a(28) =16384a(29) =29