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A155310 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 184, 1073, 8931, 73812, 639377, 7143496, 110082014, 2154472585, 48658986855, 1307630014597 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..17.

EXAMPLE

Maximal 12 X 12 X 12 example

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

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

............0.1.1

...........0.1.0.0

..........1.1.0.0.1

.........0.0.0.1.1.0

........0.0.1.0.0.1.0

.......1.1.1.0.1.0.1.1

......1.0.0.1.0.1.0.0.0

.....0.0.1.0.0.1.0.1.0.0

....1.1.1.0.1.1.0.0.1.1.1

...1.0.0.1.0.0.1.0.1.0.0.1

CROSSREFS

Sequence in context: A155250 A155260 A155244 * A155288 A155293 A155311

Adjacent sequences:  A155307 A155308 A155309 * A155311 A155312 A155313

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified July 4 20:49 EDT 2022. Contains 355086 sequences. (Running on oeis4.)