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A155276
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Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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1, 7, 25, 55, 240, 1414, 11201, 99274, 1021345, 13018434, 219559590, 4642417867, 119857654154
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