Number of antichains in the first n elements of the infinite Boolean lattice.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =6a(5) =11a(6) =14a(7) =19a(8) =20a(9) =39a(10) =53a(11) =78a(12) =84a(13) =134a(14) =148a(15) =167a(16) =168a(17) =335a(18) =483a(19) =765a(20) =849a(21) =1466a(22) =1681a(23) =1988a(24) =2008a(25) =3700a(26) =4414a(27) =5489a(28) =5573a(29) =7265