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A155320 Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 3,0 4,0 4,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 13, 28, 129, 586, 2176, 14358, 112046, 791851, 8217946, 101868365, 1252862099, 20806137393 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

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

EXAMPLE

Maximal 11 X 11 X 11 example

.............1

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

...........1.0.0

..........1.0.0.1

.........1.1.0.1.1

........0.0.0.0.0.1

.......0.0.0.0.0.0.1

......1.1.1.1.1.0.1.1

.....0.1.0.0.1.0.0.0.0

....1.0.0.1.0.0.1.0.0.1

...1.1.1.1.1.0.1.1.1.1.1

CROSSREFS

Sequence in context: A155257 A155224 A155238 * A155279 A155331 A155387

Adjacent sequences:  A155317 A155318 A155319 * A155321 A155322 A155323

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 2 01:30 EDT 2022. Contains 357191 sequences. (Running on oeis4.)