Triangle read by rows: T(n,k) = number of n-element unlabeled N-free posets of height k (1 <= k <= n).
A202181
Triangle read by rows: T(n,k) = number of n-element unlabeled N-free posets of height k (1 <= k <= n).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =7a(8) =6a(9) =1a(10) =1a(11) =13a(12) =24a(13) =10a(14) =1a(15) =1a(16) =25a(17) =77a(18) =61a(19) =15a(20) =1a(21) =1a(22) =43a(23) =228a(24) =291a(25) =130a(26) =21a(27) =1a(28) =1a(29) =76
External references
- oeis: A202181