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A155370 Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,1 3,1 4,1 4,2 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 124, 545, 2932, 15809, 100710, 785638, 7143835, 76372256, 962177079, 14293799953, 248275319618 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

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

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........0.0

..........1.1.0

.........0.1.1.0

........0.0.0.1.1

.......0.0.0.0.1.1

......0.1.1.0.0.0.0

.....0.1.1.0.1.1.0.0

....1.1.0.0.0.1.1.1.1

...1.1.0.0.0.0.0.0.1.1

CROSSREFS

Sequence in context: A098481 A155334 A155422 * A155442 A155324 A155325

Adjacent sequences:  A155367 A155368 A155369 * A155371 A155372 A155373

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified May 18 19:58 EDT 2021. Contains 344002 sequences. (Running on oeis4.)