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A155245 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 70, 416, 2481, 24212, 281815, 3600076, 66159319, 1542429625, 45797988541, 1765262317904 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

COMMENTS

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

LINKS

Table of n, a(n) for n=3..15.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........0.1.1

..........0.0.0.1

.........1.0.0.0.0

........1.0.0.0.1.1

.......0.1.1.0.1.0.0

......1.0.0.1.0.1.0.1

.....1.0.0.0.0.1.0.0.1

....0.1.0.1.1.0.0.0.1.0

...1.1.0.1.0.1.1.0.0.1.1

CROSSREFS

Sequence in context: A000970 A247620 A240156 * A155291 A155221 A213569

Adjacent sequences: A155242 A155243 A155244 * A155246 A155247 A155248

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified December 9 13:45 EST 2022. Contains 358700 sequences. (Running on oeis4.)