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A155230 Number of ways to place zero or more nonadjacent 1,0 2,0 2,1 2,2 3,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 249, 2622, 27709, 246241, 3322988, 74905084, 2082119083, 63776107886, 2604956304910, 150599199628251, 11318149143066683 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

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

EXAMPLE

Maximal 13 X 13 X 13 example

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

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

.............0.0.0

............1.0.0.1

...........1.0.0.0.1

..........1.1.0.0.1.1

.........0.0.1.0.1.0.0

........0.1.0.0.0.0.1.0

.......1.1.0.1.1.1.0.1.1

......0.1.0.0.0.1.0.0.1.0

.....1.0.1.0.1.0.1.0.1.0.1

....0.1.0.0.0.1.0.0.0.0.1.0

...0.1.1.1.0.1.1.1.0.1.1.1.0

CROSSREFS

Sequence in context: A155276 A155270 A155256 * A155231 A155261 A268239

Adjacent sequences:  A155227 A155228 A155229 * A155231 A155232 A155233

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified November 19 06:34 EST 2019. Contains 329310 sequences. (Running on oeis4.)