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A155432 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 2,1 3,2 3,3 4,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 19, 31, 90, 468, 2292, 9110, 38413, 235563, 1945805, 17222547, 150113688, 1482231064, 18382767078, 277079737938, 4675639304317, 86210376981027, 1821940183878931 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

COMMENTS

Same series for 1,0 1,1 2,0 2,2 3,0 3,2 4,1 4,2 polyhexes.

LINKS

Table of n, a(n) for n=4..23.

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........1.1

.........0.1.1

........1.1.0.0

.......0.1.1.0.0

......0.0.0.0.1.1

.....1.0.1.0.1.1.0

....1.1.1.1.0.0.1.1

...0.1.0.1.0.0.1.1.0

CROSSREFS

Sequence in context: A301119 A098576 A063773 * A155302 A155362 A034966

Adjacent sequences:  A155429 A155430 A155431 * A155433 A155434 A155435

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified December 8 20:37 EST 2021. Contains 349596 sequences. (Running on oeis4.)