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A155312 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,2 4,3 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 43, 172, 775, 4404, 27025, 209013, 1889445, 19997883, 257549066, 3935142613 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..17.

EXAMPLE

Maximal 13 X 13 X 13 example

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

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

.............1.1.0

............0.0.1.0

...........0.0.0.1.0

..........0.1.1.0.1.1

.........0.1.0.0.0.0.0

........0.1.0.1.0.1.0.1

.......1.1.0.1.0.1.0.1.0

......0.0.0.0.1.0.1.0.1.0

.....0.0.0.1.0.1.0.1.0.1.0

....1.1.1.1.0.0.1.0.1.0.1.0

...1.0.0.0.0.0.1.0.1.0.1.0.0

CROSSREFS

Sequence in context: A155427 A155403 A155350 * A155351 A155430 A155247

Adjacent sequences:  A155309 A155310 A155311 * A155313 A155314 A155315

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 2 06:08 EDT 2022. Contains 357191 sequences. (Running on oeis4.)