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A155387 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,0 5,0 6,0 7,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 13, 28, 131, 616, 2619, 12958, 65721, 390933, 2891029, 23149838 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..17.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.0.0

.........1.0.1.1

........1.0.0.0.1

.......1.0.0.0.0.1

......1.0.0.0.0.0.1

.....0.1.0.0.0.0.0.1

....1.0.0.0.0.0.1.0.1

...0.1.1.1.1.1.1.0.1.0

CROSSREFS

Sequence in context: A155320 A155279 A155331 * A155366 A135039 A168559

Adjacent sequences:  A155384 A155385 A155386 * A155388 A155389 A155390

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified September 16 02:16 EDT 2019. Contains 327088 sequences. (Running on oeis4.)