Triangle A(n,m) of numbers of n-element T_0-antichains on a labeled m-set, m=0,...,2^n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =0a(6) =0a(7) =1a(8) =6a(9) =12a(10) =0a(11) =0a(12) =0a(13) =2a(14) =52a(15) =520a(16) =2640a(17) =6720a(18) =6720a(19) =0a(20) =0a(21) =0a(22) =0a(23) =25a(24) =1770a(25) =53940a(26) =1012620a(27) =13487040a(28) =136745280a(29) =1094688000