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A155306 Number of ways to place zero or more nonadjacent 1,0 2,0 3,1 3,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 208, 1168, 8750, 74240, 701683, 8051955, 120548805, 2289918377, 52736906771 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..16.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........0.0.0

..........1.1.0.1

.........1.0.0.0.1

........0.1.0.0.1.0

.......0.1.0.0.0.1.0

......0.0.1.0.1.1.0.1

.....1.0.0.0.0.0.0.0.1

....0.1.1.0.1.0.0.1.1.0

...0.0.0.1.1.0.1.1.0.0.0

CROSSREFS

Sequence in context: A155293 A155311 A155289 * A155240 A155298 A155292

Adjacent sequences:  A155303 A155304 A155305 * A155307 A155308 A155309

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified May 28 07:06 EDT 2022. Contains 354112 sequences. (Running on oeis4.)