Triangle read by rows: T(n,k) is the number of n-element unlabeled N-free posets with k connected components.

A350783

Triangle read by rows: T(n,k) is the number of n-element unlabeled N-free posets with k connected components.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =1a(5) =1a(6) =9a(7) =4a(8) =1a(9) =1a(10) =31a(11) =12a(12) =4a(13) =1a(14) =1a(15) =115a(16) =46a(17) =13a(18) =4a(19) =1a(20) =1a(21) =474a(22) =173a(23) =49a(24) =13a(25) =4a(26) =1a(27) =1a(28) =2097a(29) =727

External references