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A155303 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,0 3,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 43, 94, 494, 5695, 45904, 323395, 2883082, 44465095, 991227125, 21279544840, 498763157584, 15169543858784, 654635049199556 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..18.

EXAMPLE

Maximal 12 X 12 X 12 example

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

.............0.1

............1.1.0

...........0.0.1.1

..........1.0.0.0.0

.........0.1.0.0.0.1

........1.1.0.0.1.1.0

.......1.0.1.0.1.0.1.1

......0.0.0.0.0.0.0.0.0

.....0.1.0.1.0.1.1.0.1.0

....1.1.0.0.1.1.0.0.0.1.1

...1.0.1.1.0.0.1.0.1.1.0.1

CROSSREFS

Sequence in context: A139828 A247905 A048488 * A268801 A155275 A155268

Adjacent sequences:  A155300 A155301 A155302 * A155304 A155305 A155306

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified January 18 14:40 EST 2022. Contains 350455 sequences. (Running on oeis4.)