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A155326 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 3,1 4,0 5,1 polyhexes in any orientation on a planar n X n X n triangular grid. 0
1, 4, 13, 28, 111, 502, 1855, 10932, 85106, 591988, 5415550, 64685900, 769802654, 11442223576 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

COMMENTS

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

LINKS

Table of n, a(n) for n=4..17.

EXAMPLE

Maximal 8 X 8 X 8 example

..........1

.........0.1

........1.1.0

.......0.1.0.1

......1.1.0.1.0

.....0.0.0.0.1.1

....1.1.1.1.0.1.0

...1.0.1.0.1.0.1.1

CROSSREFS

Sequence in context: A009561 A155266 A155413 * A155257 A155224 A155238

Adjacent sequences:  A155323 A155324 A155325 * A155327 A155328 A155329

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 12 21:52 EDT 2022. Contains 356077 sequences. (Running on oeis4.)