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A155431 Number of ways to place zero or more nonadjacent 2,0 2,1 3,0 3,1 3,2 3,3 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 94, 344, 2238, 14169, 77290, 503317, 4355803, 49651747, 642476027, 8840925123, 141069431209, 2761281750433 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

COMMENTS

Same series for 2,0 2,1 3,0 3,2 3,3 4,1 5,1 polyhexes.

LINKS

Table of n, a(n) for n=5..20.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........0.0

..........1.1.0

.........1.1.1.1

........0.1.0.0.0

.......0.1.0.0.1.0

......1.0.0.0.0.1.1

.....0.1.0.0.0.0.1.1

....0.1.1.1.1.0.1.1.0

...0.0.1.1.0.0.1.0.0.0

CROSSREFS

Sequence in context: A155429 A155346 A155398 * A155329 A155424 A155349

Adjacent sequences:  A155428 A155429 A155430 * A155432 A155433 A155434

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified July 5 15:05 EDT 2022. Contains 355099 sequences. (Running on oeis4.)