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A155381 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,2 3,3 4,3 5,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 85, 361, 2039, 11043, 58636, 358519, 2835051, 27482639, 303186845, 3695516821, 51352363033 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..19.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.1.0

.........0.0.1.1

........0.0.0.1.0

.......0.0.0.1.0.0

......1.1.1.0.0.0.0

.....0.1.0.0.1.0.0.1

....0.1.0.0.0.1.1.1.1

...1.1.1.0.0.0.1.0.0.1

CROSSREFS

Sequence in context: A155353 A155317 A237052 * A155393 A155314 A155321

Adjacent sequences:  A155378 A155379 A155380 * A155382 A155383 A155384

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified November 28 01:24 EST 2021. Contains 349396 sequences. (Running on oeis4.)