Triangle read by rows: T(n,k) (n>=1, k>=1) is the number of posets with n elements whose Hasse diagram has k connected components.

A263864

Triangle read by rows: T(n,k) (n>=1, k>=1) is the number of posets with n elements whose Hasse diagram has k connected components.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =1a(5) =1a(6) =10a(7) =4a(8) =1a(9) =1a(10) =44a(11) =13a(12) =4a(13) =1a(14) =1a(15) =238a(16) =60a(17) =14a(18) =4a(19) =1a(20) =1a(21) =1650a(22) =312a(23) =63a(24) =14a(25) =4a(26) =1a(27) =1a(28) =14512a(29) =2075

External references