Number of subsets of {1..n} of which every subset has a different sum.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =13a(5) =22a(6) =36a(7) =56a(8) =91a(9) =135a(10) =211a(11) =307a(12) =446a(13) =625a(14) =882a(15) =1194a(16) =1677a(17) =2238a(18) =3031a(19) =4001a(20) =5460a(21) =6995a(22) =9302a(23) =11921a(24) =15424a(25) =19554a(26) =25032a(27) =31005a(28) =39170a(29) =48251