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A155394 Number of ways to place zero or more nonadjacent 1,1 2,1 3,0 3,1 4,2 4,3 5,2 6,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 67, 219, 1086, 6381, 31966, 154641, 952314, 7600004, 73667522, 781898311, 8779500403 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..20.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........0.1.0

..........0.0.1.1

.........0.1.1.0.0

........0.0.0.1.0.0

.......0.0.1.0.1.0.0

......1.0.1.0.0.0.1.0

.....0.1.1.0.1.1.1.0.0

....0.1.0.1.0.0.0.1.1.1

...0.1.0.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A121091 A213489 A288021 * A155412 A155420 A155434

Adjacent sequences:  A155391 A155392 A155393 * A155395 A155396 A155397

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 6 05:47 EDT 2022. Contains 357261 sequences. (Running on oeis4.)