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A155309 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 52, 196, 938, 5406, 33082, 270615, 2652565, 30092725, 403696211, 6603268906 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

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

EXAMPLE

Maximal 13 X 13 X 13 example

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

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

.............0.0.1

............0.1.1.0

...........1.1.0.0.1

..........1.0.0.0.1.0

.........0.0.1.1.0.1.0

........0.1.1.0.0.1.0.1

.......1.1.0.0.0.0.1.0.1

......0.0.0.1.0.0.1.0.1.0

.....1.1.0.0.1.1.0.0.0.1.0

....0.0.1.1.0.0.1.1.0.1.0.0

...0.0.0.0.1.1.0.0.1.0.1.0.0

CROSSREFS

Sequence in context: A155347 A155385 A155345 * A155419 A155246 A155414

Adjacent sequences:  A155306 A155307 A155308 * A155310 A155311 A155312

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 15 15:14 EDT 2019. Contains 328030 sequences. (Running on oeis4.)