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A155385 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 3,1 4,1 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 52, 181, 571, 2900, 15410, 91393, 670564, 5234213, 49806306, 539502855 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..18.

EXAMPLE

Maximal 12 X 12 X 12 example

..............1

.............0.1

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

...........1.0.1.1

..........1.0.0.1.0

.........1.1.0.1.0.1

........0.1.0.1.0.0.1

.......0.0.1.0.0.0.0.1

......1.0.0.1.0.0.0.1.1

.....0.1.0.0.0.0.0.0.1.0

....0.0.1.1.0.0.0.0.1.0.0

...0.0.0.1.1.1.1.0.1.0.0.0

CROSSREFS

Sequence in context: A100450 A155423 A155347 * A155345 A155309 A155419

Adjacent sequences:  A155382 A155383 A155384 * A155386 A155387 A155388

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 19 04:34 EDT 2019. Contains 326109 sequences. (Running on oeis4.)