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A155403 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,2 5,3 6,3 7,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 43, 130, 472, 2062, 9990, 51107, 296798, 2149983, 17713635 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

Table of n, a(n) for n=7..18.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........0.0.0

.........1.0.0.0

........0.1.0.0.0

.......1.0.1.1.1.1

......0.1.0.0.0.0.1

.....0.0.1.1.1.1.0.1

....0.0.0.0.0.0.1.0.0

...0.0.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A124700 A155336 A155427 * A155350 A155312 A155351

Adjacent sequences:  A155400 A155401 A155402 * A155404 A155405 A155406

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 5 03:25 EDT 2022. Contains 357240 sequences. (Running on oeis4.)