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A155285 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 13, 37, 73, 258, 1871, 22758, 161452, 1241904, 16300245, 324762872, 7210518148, 157052254320, 4356147792581 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..17.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

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

..........0.0.0.1

.........1.1.0.1.0

........1.0.0.0.0.1

.......1.0.0.1.0.0.1

......0.1.1.0.1.1.1.0

.....1.0.0.0.0.0.0.0.1

....1.0.0.1.0.0.1.0.0.1

...0.1.1.1.0.0.0.1.1.1.0

CROSSREFS

Sequence in context: A158864 A003154 A083577 * A155262 A155301 A155284

Adjacent sequences:  A155282 A155283 A155284 * A155286 A155287 A155288

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified June 22 17:19 EDT 2018. Contains 305672 sequences. (Running on oeis4.)