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A155319 Number of ways to place zero or more nonadjacent 1,1 2,1 2,2 3,1 4,0 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 162, 682, 2796, 19279, 139378, 1039172, 10455828, 121464277, 1566433989, 25757470951 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

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

EXAMPLE

Maximal 12 X 12 X 12 example

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

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

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

...........0.0.1.0

..........0.1.0.1.1

.........0.1.1.0.1.0

........0.1.0.0.0.0.0

.......1.1.0.1.0.0.1.0

......0.1.0.1.1.0.1.1.0

.....1.0.0.0.0.1.0.0.1.0

....1.1.1.1.1.0.1.1.0.1.1

...0.0.0.0.1.0.0.1.0.0.1.0

CROSSREFS

Sequence in context: A155376 A155377 A155227 * A155318 A155280 A155365

Adjacent sequences:  A155316 A155317 A155318 * A155320 A155321 A155322

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 1 14:19 EDT 2022. Contains 357149 sequences. (Running on oeis4.)