Number of maximal subsets of {1..n} containing no sums or products of distinct elements.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =2a(5) =4a(6) =5a(7) =10a(8) =13a(9) =20a(10) =28a(11) =40a(12) =54a(13) =82a(14) =120a(15) =172a(16) =244a(17) =347a(18) =471a(19) =651a(20) =874a(21) =1198a(22) =1635a(23) =2210a(24) =2867a(25) =3895a(26) =5234a(27) =6889a(28) =9019a(29) =11919