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A155438 Number of ways to place zero or more nonadjacent 2,1 2,2 3,1 4,0 4,1 5,2 6,3 6,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 73, 192, 799, 5700, 31065, 143784, 760292, 5454945, 52282160, 593679020, 6642535818, 77363263396 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..21.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........1.0.0

..........0.1.1.1

.........0.1.0.0.1

........0.1.0.0.0.0

.......1.0.1.0.1.1.0

......1.0.0.0.0.0.1.0

.....0.1.0.0.1.0.0.1.1

....0.0.1.1.1.0.0.1.0.0

...0.0.1.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A155420 A155434 A155378 * A155396 A155411 A155436

Adjacent sequences:  A155435 A155436 A155437 * A155439 A155440 A155441

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified September 29 04:50 EDT 2022. Contains 357082 sequences. (Running on oeis4.)