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A155225
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Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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1, 3, 7, 13, 38, 180, 805, 3814, 25700, 220335, 2064779, 23174247, 331474649, 5713874467, 116010028877, 2863484145009, 86429492811884, 3140385298427338, 137283404960168681, 7274093873738312075
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