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A155236 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 13, 37, 210, 1538, 9864, 106941, 1433656, 22817924, 508623094, 13424571091 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..14.

EXAMPLE

Maximal 11 X 11 X 11 example

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

............1.1

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

..........0.0.0.1

.........1.0.0.0.1

........1.0.0.0.0.0

.......1.0.1.0.1.0.1

......1.0.0.1.0.1.0.1

.....0.1.0.0.1.0.1.0.1

....0.0.0.1.0.1.0.1.0.1

...1.1.1.1.0.1.0.1.0.1.0

CROSSREFS

Sequence in context: A155283 A155282 A193646 * A155277 A090042 A266882

Adjacent sequences: A155233 A155234 A155235 * A155237 A155238 A155239

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified March 25 10:41 EDT 2023. Contains 361520 sequences. (Running on oeis4.)