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A155412 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 3,2 4,3 5,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 67, 231, 1339, 8869, 45413, 237925, 1625066, 15388021, 179623547, 2180692829, 28227148274, 428766984919 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..20.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.1.0

.........1.0.1.0

........0.0.1.0.1

.......1.1.0.1.1.0

......0.0.1.0.0.0.1

.....0.1.1.0.1.1.0.1

....0.1.0.0.1.0.1.1.0

...0.0.1.1.0.1.0.0.0.0

CROSSREFS

Sequence in context: A213489 A288021 A155394 * A155420 A155434 A155378

Adjacent sequences:  A155409 A155410 A155411 * A155413 A155414 A155415

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 16 11:28 EDT 2022. Contains 356168 sequences. (Running on oeis4.)