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A155390 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,1 5,1 6,1 7,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 78, 382, 1679, 8329, 45625, 259832, 1747805, 14220936 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

Table of n, a(n) for n=7..17.

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.0.0

.........1.0.1.0

........0.1.0.1.0

.......0.1.0.0.1.0

......0.1.0.0.0.1.1

.....0.1.0.0.0.0.0.1

....0.0.0.1.1.1.1.0.1

...1.1.1.1.0.0.0.0.0.1

CROSSREFS

Sequence in context: A111011 A144723 A062551 * A269784 A237436 A300556

Adjacent sequences:  A155387 A155388 A155389 * A155391 A155392 A155393

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 17 16:57 EDT 2019. Contains 326059 sequences. (Running on oeis4.)