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A155321
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Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 3,1 3,2 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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1, 7, 19, 37, 88, 676, 4377, 23168, 128083, 1375195, 16989531, 217989023, 2931139962, 55566047699, 1303222849730, 35399619266821
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OFFSET
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4,2
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COMMENTS
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Same series for 0,0 1,0 2,1 2,2 3,1 4,2 polyhexes.
Same series for 0,0 1,0 1,1 2,0 2,1 3,1 3,2 4,2 polyhexes.
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LINKS
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Table of n, a(n) for n=4..19.
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EXAMPLE
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Maximal 9 X 9 X 9 example
...........0
..........0.0
.........1.1.1
........0.1.0.1
.......0.0.0.1.1
......0.0.0.0.0.0
.....1.1.0.0.1.1.1
....0.1.0.1.0.1.0.1
...0.0.1.1.1.0.0.1.1
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CROSSREFS
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Sequence in context: A155381 A155393 A155314 * A155425 A155410 A155429
Adjacent sequences: A155318 A155319 A155320 * A155322 A155323 A155324
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 22 2009
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STATUS
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approved
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