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

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =9a(5) =15a(6) =25a(7) =41a(8) =68a(9) =109a(10) =179a(11) =284a(12) =443a(13) =681a(14) =1062a(15) =1587a(16) =2440a(17) =3638a(18) =5443a(19) =8021a(20) =11953a(21) =17273a(22) =25578a(23) =37001a(24) =53953a(25) =77429a(26) =113063a(27) =160636a(28) =232928a(29) =330775