Triangular array read by rows: T(n,k) is the number of labeled posets on [n] that are composed of exactly k irreducible posets, n >= 0, 0 <= k <= n.

A354615

Triangular array read by rows: T(n,k) is the number of labeled posets on [n] that are composed of exactly k irreducible posets, n >= 0, 0 <= k <= n.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =2a(6) =0a(7) =7a(8) =6a(9) =6a(10) =0a(11) =97a(12) =62a(13) =36a(14) =24a(15) =0a(16) =2251a(17) =1110a(18) =510a(19) =240a(20) =120a(21) =0a(22) =80821a(23) =30902a(24) =11340a(25) =4440a(26) =1800a(27) =720a(28) =0a(29) =4305127

External references