Triangle T(n,k) of weakly graded (3+1)-free partially ordered sets (posets) on n labeled vertices with height k.

A222866

Triangle T(n,k) of weakly graded (3+1)-free partially ordered sets (posets) on n labeled vertices with height k.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =1a(4) =12a(5) =6a(6) =1a(7) =86a(8) =84a(9) =24a(10) =1a(11) =840a(12) =1110a(13) =480a(14) =120a(15) =1a(16) =11642a(17) =16620a(18) =9120a(19) =3240a(20) =720a(21) =1a(22) =227892a(23) =300846a(24) =185640a(25) =82320a(26) =25200a(27) =5040a(28) =1a(29) =6285806

External references