Number of subsets of {1..n} containing all of their integer quotients > 1.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =32a(6) =48a(7) =96a(8) =144a(9) =288a(10) =432a(11) =864a(12) =1104a(13) =2208a(14) =3312a(15) =5184a(16) =7872a(17) =15744a(18) =20112a(19) =40224a(20) =53376a(21) =84640a(22) =126960a(23) =253920a(24) =309600a(25) =619200a(26) =928800a(27) =1475136a(28) =1984320a(29) =3968640