A380860
Sequences linked to this entry ?
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A380860: Triangle read by rows: T(n,m) (0<=m<=n) = number of positive n-digit numbers that have exactly m copies of a specific, previously selected positive ba…
identification, match triangle
1 · 8, 1 · 72, 17, 1 · 648, 225, 26, 1 … Σ 1, 9, 90, 900, 9000, 90000, 900000, …