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A155359 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 2,2 3,1 3,2 4,3 5,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 106, 470, 2439, 14648, 89078, 630810, 5607878, 61467315, 775395804, 11138538259, 187481058138 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

COMMENTS

Same series for 1,0 2,0 2,2 3,1 3,2 4,1 5,1 polyhexes.

LINKS

Table of n, a(n) for n=5..19.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........1.0

..........1.1.1

.........0.1.1.0

........0.1.0.0.0

.......0.1.0.0.1.0

......0.0.0.0.0.1.0

.....1.1.0.0.0.0.1.1

....0.1.1.1.1.0.1.1.1

...0.1.1.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A155416 A155391 A155400 * A098481 A155334 A155422

Adjacent sequences:  A155356 A155357 A155358 * A155360 A155361 A155362

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified May 16 09:28 EDT 2021. Contains 343940 sequences. (Running on oeis4.)