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A155301 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 3,2 4,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 13, 37, 73, 274, 2707, 30458, 210247, 1927098, 30544775, 732699440, 16750707651, 417262694530, 14440304500005, 706310189376904 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

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

EXAMPLE

Maximal 13 X 13 X 13 example

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

..............0.1

.............1.1.0

............1.0.1.0

...........0.1.0.0.0

..........0.0.0.0.0.0

.........1.0.0.0.0.0.1

........1.0.1.0.0.1.0.1

.......0.1.1.0.0.0.1.1.0

......1.0.0.1.0.0.1.0.0.1

.....1.0.1.0.0.1.0.0.1.0.1

....0.1.1.0.1.1.0.1.0.1.1.0

...0.0.0.1.0.0.1.1.0.1.0.0.0

CROSSREFS

Sequence in context: A083577 A155285 A155262 * A155284 A155304 A183454

Adjacent sequences:  A155298 A155299 A155300 * A155302 A155303 A155304

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified January 17 20:06 EST 2022. Contains 350410 sequences. (Running on oeis4.)