Triangle read by rows: T(n,m) (n>=0, 1 <= m <= n+1) = number of unlabeled rigid interval posets with n non-maximal and m maximal elements.

A193344

Triangle read by rows: T(n,m) (n>=0, 1 <= m <= n+1) = number of unlabeled rigid interval posets with n non-maximal and m maximal elements.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =2a(6) =2a(7) =9a(8) =13a(9) =6a(10) =5a(11) =32a(12) =72a(13) =69a(14) =24a(15) =16a(16) =132a(17) =409a(18) =605a(19) =432a(20) =120a(21) =61a(22) =623a(23) =2480a(24) =5016a(25) =5498a(26) =3120a(27) =720a(28) =271a(29) =3314

External references