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A155232 Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 2,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 22, 40, 361, 2821, 19057, 110575, 1423822, 26284909, 502358770, 9341556682, 253322462407, 10114422061267, 485429682957349, 25616146962812161, 1724462843271452173, 157410261704230494205 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..20.

EXAMPLE

Maximal 13 X 13 X 13 example

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

..............1.1

.............1.0.1

............0.0.0.0

...........1.0.1.1.1

..........1.0.0.0.1.0

.........1.1.1.0.1.0.1

........0.0.0.0.0.0.0.1

.......1.0.1.0.0.0.1.1.1

......0.1.1.0.0.0.0.0.0.0

.....1.0.1.0.1.0.1.0.1.0.1

....1.0.0.0.0.1.0.1.1.0.0.1

...1.1.1.0.1.1.1.0.1.0.1.1.1

CROSSREFS

Sequence in context: A155287 A155337 A155402 * A188281 A227327 A023609

Adjacent sequences:  A155229 A155230 A155231 * A155233 A155234 A155235

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified March 4 02:30 EST 2021. Contains 341773 sequences. (Running on oeis4.)