Triangle T(n,k) of strongly graded (3+1)-free partially ordered sets (posets) on n labeled vertices with height k.
A222864
Triangle T(n,k) of strongly graded (3+1)-free partially ordered sets (posets) on n labeled vertices with height k.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =1a(4) =6a(5) =6a(6) =1a(7) =50a(8) =36a(9) =24a(10) =1a(11) =510a(12) =510a(13) =240a(14) =120a(15) =1a(16) =7682a(17) =7380a(18) =4800a(19) =1800a(20) =720a(21) =1a(22) =161406a(23) =141246a(24) =91560a(25) =47040a(26) =15120a(27) =5040a(28) =1a(29) =4747010
External references
- oeis: A222864