A052141
Sequences linked to this entry ?
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A316649: Triangle read by rows in which T(n,k) is the number of length k chains from (0,0) to (n,n) of the poset [n] X [n] ordered by the product order, 0 <= k…
match row sums
1 · 0, 1, 2 · 0, 1, 7, 12, 6 … Σ 1, 3, 26, 252, 2568, 26928, 287648, …