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A155247 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,2 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 43, 187, 1189, 7473, 55294, 540344, 6609867, 96912191, 1762761733, 39425343425, 1088609961302 (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

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

...........0.1.1

..........0.1.0.0

.........1.1.0.0.0

........0.0.0.0.0.0

.......1.0.1.0.1.0.1

......0.1.0.1.0.1.0.1

.....0.1.0.1.0.1.0.1.0

....0.1.0.1.0.1.0.1.0.0

...0.0.1.0.1.0.1.0.1.0.0

CROSSREFS

Sequence in context: A155312 A155351 A155430 * A113927 A155399 A330854

Adjacent sequences:  A155244 A155245 A155246 * A155248 A155249 A155250

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified June 17 00:17 EDT 2021. Contains 345080 sequences. (Running on oeis4.)