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A155416 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 3,2 4,2 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 103, 427, 2239, 11637, 57017, 383473, 3234253, 30969391, 316348867 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

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

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........0.0.0

..........1.1.0.0

.........0.0.1.1.0

........0.0.0.1.1.1

.......0.0.0.0.0.0.1

......1.1.0.0.1.1.0.0

.....0.0.1.1.0.0.1.1.0

....0.0.0.1.1.1.0.1.1.1

...0.0.0.0.0.0.1.0.0.0.1

CROSSREFS

Sequence in context: A155379 A155243 A155417 * A155391 A155400 A155359

Adjacent sequences:  A155413 A155414 A155415 * A155417 A155418 A155419

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 16 15:19 EDT 2022. Contains 356168 sequences. (Running on oeis4.)