Number of subsets of {2..n} containing all of their integer quotients > 1.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =16a(6) =24a(7) =48a(8) =72a(9) =144a(10) =216a(11) =432a(12) =552a(13) =1104a(14) =1656a(15) =2592a(16) =3936a(17) =7872a(18) =10056a(19) =20112a(20) =26688a(21) =42320a(22) =63480a(23) =126960a(24) =154800a(25) =309600a(26) =464400a(27) =737568a(28) =992160a(29) =1984320