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A155304 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 3,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 13, 37, 73, 309, 2413, 28415, 205131, 1898471, 29029014, 631146446, 14579044094, 368315888227, 12424744049760, 572778669577292 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..18.

EXAMPLE

Maximal 11 X 11 X 11 example

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

............1.1

...........1.0.1

..........0.0.1.0

.........0.1.0.1.0

........1.1.0.0.0.1

.......1.0.0.1.1.0.1

......0.1.1.0.0.1.1.0

.....1.0.0.0.0.0.0.0.1

....1.0.1.1.0.0.1.1.0.1

...0.1.1.0.0.0.0.0.1.1.0

CROSSREFS

Sequence in context: A155262 A155301 A155284 * A183454 A155265 A155253

Adjacent sequences:  A155301 A155302 A155303 * A155305 A155306 A155307

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified January 26 23:54 EST 2022. Contains 350601 sequences. (Running on oeis4.)