Number of subsets of {1..n} containing the sum of every subset whose sum is <= n.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =12a(5) =19a(6) =31a(7) =47a(8) =73a(9) =110a(10) =168a(11) =247a(12) =375a(13) =546a(14) =817a(15) =1193a(16) =1769a(17) =2552a(18) =3791a(19) =5445a(20) =8012a(21) =11517a(22) =16899a(23) =24144a(24) =35391a(25) =50427a(26) =73614a(27) =104984a(28) =152656a(29) =216802