112530

Appears in sequences

• Number of Barlow packings that repeat after exactly n layers.at n=24A011768
• Number of functions from [1,2,...,n] to [1,2,...,n] such that the image contains exactly two elements.at n=9A068605
• Number of 3 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=8A207454
• Number of Dyck paths of length 2n with exactly 2 hills.at n=13A294527
• Triangle read by rows. T(n, k) = FallingFactorial(n - k, k) * Stirling2(n - k, k), for n >= 0 and 0 <= k <= n//2, where '//' denotes integer division.at n=51A362789
• Number of different closest packings of equal spheres for hexagonal crystals having repeat period n.at n=24A371991