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A155248 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 2,1 3,0 3,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 209, 1577, 10287, 78555, 928301, 14022349, 239786776, 5085100887, 142197577695, 5014181558576, 216402828969373 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..17.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........0.0.0

.........0.0.1.1

........1.1.0.1.1

.......1.1.0.0.1.1

......1.1.0.0.0.0.0

.....0.0.0.1.1.0.1.1

....1.1.1.0.1.1.0.1.1

...0.1.1.1.0.1.1.0.1.1

CROSSREFS

Sequence in context: A155388 A155367 A155357 * A027452 A051937 A119327

Adjacent sequences:  A155245 A155246 A155247 * A155249 A155250 A155251

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified November 18 17:21 EST 2019. Contains 329287 sequences. (Running on oeis4.)