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A155284 Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 3,1 4,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 13, 37, 73, 309, 2413, 28031, 212649, 2010251, 29604759, 633868196, 15160513746, 396011442436, 13223926465865, 597617100526032 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..18.

EXAMPLE

Maximal 11 X 11 X 11 example

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

............1.0

...........1.1.1

..........0.0.0.1

.........0.1.0.1.0

........1.1.1.0.0.0

.......1.0.0.0.0.1.1

......0.1.0.1.1.0.0.1

.....1.0.0.0.0.1.0.1.0

....1.1.0.1.0.1.0.1.1.0

...0.0.1.1.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A155285 A155262 A155301 * A155304 A183454 A155265

Adjacent sequences:  A155281 A155282 A155283 * A155285 A155286 A155287

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified May 28 05:47 EDT 2022. Contains 354112 sequences. (Running on oeis4.)