Triangle read by rows: T(n,k) = number of n-element unlabeled connected N-free posets of height k (1 <= k <= n).
A202178
Triangle read by rows: T(n,k) = number of n-element unlabeled connected N-free posets of height k (1 <= k <= n).
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =1a(6) =0a(7) =3a(8) =5a(9) =1a(10) =0a(11) =4a(12) =17a(13) =9a(14) =1a(15) =0a(16) =5a(17) =45a(18) =50a(19) =14a(20) =1a(21) =0a(22) =6a(23) =115a(24) =218a(25) =114a(26) =20a(27) =1a(28) =0a(29) =7
External references
- oeis: A202178