A253284
Sequences linked to this entry ?
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A253284: Triangle read by rows, T(n,k) = (k+1)*(n+1)!*(n+k)!/((k+1)!^2*(n-k)!) with n >= 0 and 0 <= k <= n.
identification, match triangle
1 · 2, 2 · 6, 18, 12 · 24, 144, 240, 120 … Σ 1, 4, 36, 528, 10800, 283680, 9102240, …