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A155362 Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 2,2 3,1 3,2 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 19, 31, 142, 704, 3110, 11340, 67080, 521405, 4456035, 36267075, 359062706, 4494388097, 66854020627, 1071365619565, 19550448735686 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..21.

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........1.1

.........1.0.1

........0.1.1.0

.......0.0.1.0.0

......0.0.0.0.0.0

.....1.1.1.0.1.1.1

....1.0.1.0.0.1.0.1

...1.1.1.0.0.0.1.1.1

CROSSREFS

Sequence in context: A063773 A155432 A155302 * A034966 A301256 A301092

Adjacent sequences:  A155359 A155360 A155361 * A155363 A155364 A155365

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 18 22:48 EDT 2021. Contains 348070 sequences. (Running on oeis4.)