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A155410
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Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 3,2 3,3 4,2 5,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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1, 7, 19, 37, 94, 297, 1458, 9766, 53099, 308101, 2235851, 20215398, 229099105, 2888943253, 39401146662, 624852187290
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OFFSET
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5,2
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COMMENTS
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Same series for 1,0 1,1 2,0 3,0 3,1 4,1 5,2 5,3 polyhexes.
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LINKS
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Table of n, a(n) for n=5..20.
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EXAMPLE
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Maximal 10 X 10 X 10 example
............0
...........0.0
..........1.1.0
.........0.1.0.0
........1.1.0.0.0
.......0.0.1.0.1.1
......1.0.1.1.0.1.0
.....1.1.0.0.0.0.1.1
....0.0.1.1.1.0.1.0.0
...0.0.1.0.1.0.1.1.0.0
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CROSSREFS
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Sequence in context: A155314 A155321 A155425 * A155429 A155346 A155398
Adjacent sequences: A155407 A155408 A155409 * A155411 A155412 A155413
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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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