Number of subsets of {1, 2, ..., n} such that no member is a sum of distinct other members.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =13a(5) =22a(6) =37a(7) =60a(8) =100a(9) =155a(10) =249a(11) =381a(12) =591a(13) =889a(14) =1365a(15) =2009a(16) =3047a(17) =4453a(18) =6602a(19) =9567a(20) =14151a(21) =20228a(22) =29654a(23) =42302a(24) =61369a(25) =87108a(26) =126066a(27) =177580a(28) =256039a(29) =360304