Triangle read by rows: T(n,k) = number of n-element unlabeled connected N-free posets of height k (2 <= k <= n).

A202179

Triangle read by rows: T(n,k) = number of n-element unlabeled connected N-free posets of height k (2 <= k <= n).

Terms

    a(0) =1a(1) =2a(2) =1a(3) =3a(4) =5a(5) =1a(6) =4a(7) =17a(8) =9a(9) =1a(10) =5a(11) =45a(12) =50a(13) =14a(14) =1a(15) =6a(16) =115a(17) =218a(18) =114a(19) =20a(20) =1a(21) =7a(22) =278a(23) =851a(24) =709a(25) =224a(26) =27a(27) =1a(28) =8a(29) =679

External references