Array read by antidiagonals where A(n,k) is the number of labeled k-antichains covering n vertices.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =0a(6) =0a(7) =1a(8) =0a(9) =0a(10) =0a(11) =1a(12) =1a(13) =0a(14) =0a(15) =0a(16) =1a(17) =6a(18) =0a(19) =0a(20) =0a(21) =0a(22) =1a(23) =25a(24) =2a(25) =0a(26) =0a(27) =0a(28) =0a(29) =1