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A155379 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,1 3,2 4,2 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 100, 521, 3034, 15439, 84733, 680192, 6722018, 71127189, 839682580, 12147844032 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..18.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.0.0

.........0.1.1.1

........1.0.1.1.1

.......1.0.0.0.0.1

......1.1.0.0.0.0.0

.....0.1.1.0.1.1.1.0

....0.0.1.0.0.0.1.1.0

...0.0.1.0.0.0.0.1.1.1

CROSSREFS

Sequence in context: A155349 A155437 A155299 * A155243 A155417 A155416

Adjacent sequences:  A155376 A155377 A155378 * A155380 A155381 A155382

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified December 8 17:01 EST 2021. Contains 349596 sequences. (Running on oeis4.)