243593040

Appears in sequences

• Number of labeled order relations on n nodes in which longest chain has 2 nodes.at n=7A055531
• Triangle T(n,k) of weakly graded (3+1)-free partially ordered sets (posets) on n labeled vertices with height k.at n=37A222866
• Triangle, read by rows: T(n,k) is the number of labeled order relations on n nodes in which the longest chain has k nodes (n>=1, 1<=k<=n).at n=37A342587