A005046
Sequences linked to this entry ?
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A156289: Triangle read by rows: T(n,k) is the number of end rhyme patterns of a poem of an even number of lines (2n) with 1<=k<=n evenly rhymed sounds.
match row sums
1 · 1, 3 · 1, 15, 15 · 1, 63, 210, 105 … Σ 1, 4, 31, 379, 6556, 150349, 4373461, …