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A155224
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Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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1, 4, 13, 28, 111, 977, 7280, 55365, 714096, 13471597, 269297226, 6772718447, 245090678582, 11547321954885, 661077498433706, 49292298477002834, 4904773608293842400
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