Number of subsets of {1..n} whose cardinality is not equal to the sum of any subset.

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =6a(5) =12a(6) =24a(7) =46a(8) =87a(9) =164a(10) =308a(11) =577a(12) =1080a(13) =2021a(14) =3779a(15) =7058a(16) =13166a(17) =24533a(18) =45674a(19) =84978a(20) =158026a(21) =293737a(22) =545747a(23) =1013467a(24) =1881032a(25) =3489303a(26) =6468910a(27) =11985988a(28) =22195905a(29) =41080751