A181289
Sequences linked to this entry ?
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A181289: Triangle read by rows: T(n,k) is the number of 2-compositions of n having length k (0 <= k <= n).
identification, match triangle
1 · 0, 2 · 0, 3, 4 · 0, 4, 12, 8 … Σ 1, 2, 7, 24, 82, 280, 956, 3264, …