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A155237
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Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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1, 4, 10, 45, 176, 869, 4190, 28277, 212331, 2073991, 22977026, 311395472, 4817775687
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OFFSET
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4,2
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LINKS
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EXAMPLE
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Maximal 13 X 13 X 13 example
...............1
..............0.1
.............1.0.1
............1.0.0.1
...........1.0.1.0.1
..........1.0.0.1.0.0
.........1.0.1.0.1.0.1
........0.0.1.0.0.1.0.1
.......1.0.1.0.0.0.1.0.1
......1.0.1.0.0.0.0.0.0.1
.....1.0.1.0.1.1.1.1.1.0.1
....1.0.0.0.0.0.0.0.0.0.0.0
...1.0.1.1.1.1.1.0.1.1.1.1.1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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