A024427
Sequences linked to this entry ?
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A136011: Irregular triangle read by rows, Stirling numbers of the second kind: columns shifted to allow (1, 1, 2, 2, 3, 3, ...) terms per row.
match row sums
1 · 1 · 1, 1 · 1, 3 … Σ 1, 1, 2, 4, 9, 22, 58, 164, …