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A155276 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 240, 1414, 11201, 99274, 1021345, 13018434, 219559590, 4642417867, 119857654154 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..16.

EXAMPLE

Maximal 11 X 11 X 11 example

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

............1.0

...........0.1.0

..........1.0.1.0

.........1.0.1.1.1

........1.1.0.0.0.0

.......0.0.1.0.1.1.1

......0.1.0.1.0.0.1.0

.....0.1.0.0.0.1.0.1.0

....0.1.0.1.1.1.1.0.1.0

...1.1.1.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A155240 A155298 A155292 * A155270 A155256 A155230

Adjacent sequences: A155273 A155274 A155275 * A155277 A155278 A155279

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified January 30 10:34 EST 2023. Contains 359943 sequences. (Running on oeis4.)