Number of subsets of {2..n} containing no products of two or more distinct elements.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =28a(6) =56a(7) =100a(8) =200a(9) =364a(10) =728a(11) =1232a(12) =2464a(13) =4592a(14) =8296a(15) =15920a(16) =31840a(17) =55952a(18) =111904a(19) =195712a(20) =362336a(21) =697360a(22) =1394720a(23) =2334112a(24) =4668224a(25) =9095392a(26) =17225312a(27) =31242784a(28) =62485568a(29) =106668608