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

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =3a(5) =3a(6) =4a(7) =4a(8) =4a(9) =5a(10) =7a(11) =7a(12) =10a(13) =10a(14) =16a(15) =18a(16) =31a(17) =31a(18) =47a(19) =47a(20) =52a(21) =62a(22) =104a(23) =104a(24) =130a(25) =159a(26) =283a(27) =283a(28) =323a(29) =323