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A155375 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,0 4,0 4,1 5,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 13, 37, 146, 614, 2467, 11092, 69586, 500162, 4040869, 39876354, 445952771 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..17.

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........0.1

.........0.1.1

........1.0.0.1

.......1.0.0.1.1

......1.1.0.0.0.1

.....1.0.0.0.0.0.0

....1.1.0.0.1.0.1.0

...1.0.0.1.1.1.1.1.1

CROSSREFS

Sequence in context: A091874 A297391 A108489 * A155307 A155344 A155418

Adjacent sequences:  A155372 A155373 A155374 * A155376 A155377 A155378

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified July 20 14:09 EDT 2019. Contains 325181 sequences. (Running on oeis4.)