Number of subsets of {2...n} containing no element whose prime indices all belong to the subset.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =10a(5) =20a(6) =30a(7) =60a(8) =96a(9) =192a(10) =312a(11) =624a(12) =936a(13) =1872a(14) =3744a(15) =7488a(16) =12480a(17) =24960a(18) =37440a(19) =74880a(20) =142848a(21) =285696a(22) =456192a(23) =912384a(24) =1548288a(25) =3096576a(26) =5308416a(27) =10616832a(28) =15925248a(29) =31850496