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A155317 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 2,2 3,1 4,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 82, 477, 3794, 21306, 111679, 917243, 11877917, 168569675, 2255808102, 36229000672, 799414704118, 22475315426770 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

COMMENTS

Same series for 1,0 1,1 2,0 2,1 3,0 3,1 3,2 4,1 polyhexes.

LINKS

Table of n, a(n) for n=4..19.

EXAMPLE

Maximal 9 X 9 X 9 example

...........0

..........1.1

.........0.1.0

........1.1.1.0

.......0.1.0.0.0

......0.0.0.0.1.1

.....1.0.1.0.0.1.0

....1.1.1.1.0.1.1.1

...0.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A155408 A155358 A155353 * A237052 A155381 A155393

Adjacent sequences:  A155314 A155315 A155316 * A155318 A155319 A155320

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 5 08:38 EDT 2022. Contains 357252 sequences. (Running on oeis4.)