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A155351 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,2 4,3 5,4 6,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 43, 186, 784, 3370, 18899, 119653, 885804, 7733006, 76760124 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..17.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........0.1.0

.........0.0.1.0

........0.0.0.1.0

.......0.1.1.0.1.0

......0.1.0.0.1.0.0

.....0.1.0.0.0.0.0.1

....0.1.0.1.1.1.1.1.0

...1.1.0.1.0.0.0.0.0.0

CROSSREFS

Sequence in context: A155403 A155350 A155312 * A155430 A155247 A113927

Adjacent sequences:  A155348 A155349 A155350 * A155352 A155353 A155354

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified January 23 21:06 EST 2022. Contains 350515 sequences. (Running on oeis4.)