Number of dependent sets with largest element n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =4a(5) =10a(6) =20a(7) =44a(8) =93a(9) =198a(10) =414a(11) =864a(12) =1788a(13) =3687a(14) =7541a(15) =15382a(16) =31200a(17) =63191a(18) =127482a(19) =256857a(20) =516404a(21) =1037104a(22) =2080357a(23) =4170283a(24) =8354078a(25) =16728270a(26) =33485553a(27) =67012082a(28) =134083661a(29) =268249350