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A155308 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 13, 37, 112, 595, 3710, 30281, 253489, 2990675, 42651723, 721885534, 15178835272 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..16.

EXAMPLE

Maximal 13 X 13 X 13 example

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

..............0.0

.............1.1.0

............0.0.1.0

...........0.0.0.1.1

..........0.1.1.0.0.1

.........0.1.0.0.1.0.0

........1.1.0.0.0.1.1.0

.......1.0.0.0.0.0.0.1.0

......0.0.1.0.0.1.0.0.1.1

.....0.1.1.0.1.1.0.1.0.0.0

....0.1.0.0.1.0.0.0.1.1.1.0

...1.1.0.1.1.0.0.0.0.0.0.1.1

CROSSREFS

Sequence in context: A126367 A139926 A155259 * A166101 A333281 A195543

Adjacent sequences:  A155305 A155306 A155307 * A155309 A155310 A155311

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified June 27 04:37 EDT 2022. Contains 354888 sequences. (Running on oeis4.)