Array read by antidiagonals: A(n,k) is the number of T_0 n-regular set-systems on a k-set.

Terms

a(0) =1a(1) =1a(2) =1a(3) =0a(4) =1a(5) =1a(6) =0a(7) =1a(8) =0a(9) =1a(10) =0a(11) =1a(12) =1a(13) =0a(14) =1a(15) =0a(16) =1a(17) =5a(18) =0a(19) =0a(20) =1a(21) =0a(22) =1a(23) =43a(24) =5a(25) =0a(26) =0a(27) =1a(28) =0a(29) =1