Number of subsets of {1..n} containing no quotients of pairs of distinct elements.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =13a(6) =23a(7) =45a(8) =89a(9) =137a(10) =253a(11) =505a(12) =897a(13) =1793a(14) =3393a(15) =6353a(16) =9721a(17) =19441a(18) =35665a(19) =71329a(20) =129953a(21) =247233a(22) =477665a(23) =955329a(24) =1700417a(25) =2657281a(26) =5184001a(27) =10368001a(28) =19407361a(29) =38814721