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A155287 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 3,2 3,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 22, 40, 147, 972, 6099, 33889, 206340, 1814635, 22696011, 314005946, 4605664055, 78764798797, 1720340418305, 47411742873448 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

COMMENTS

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

LINKS

Table of n, a(n) for n=3..19.

EXAMPLE

Maximal 12 X 12 X 12 example

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

.............0.1

............0.0.1

...........1.1.1.0

..........0.0.0.0.1

.........1.1.0.0.1.0

........1.0.1.0.1.0.0

.......1.0.0.1.0.1.1.1

......0.0.0.0.0.0.0.0.0

.....1.1.0.1.0.0.1.0.1.1

....1.0.1.0.1.0.1.0.1.0.1

...1.0.0.1.0.1.1.0.1.0.0.1

CROSSREFS

Sequence in context: A155404 A155360 A155382 * A155337 A155402 A155232

Adjacent sequences:  A155284 A155285 A155286 * A155288 A155289 A155290

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 17 21:17 EDT 2021. Contains 348065 sequences. (Running on oeis4.)