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A155340 Number of ways to place zero or more nonadjacent 1,0 2,0 3,1 3,2 3,3 4,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 61, 257, 2034, 12328, 53385, 258324, 2321815, 29642532, 362215522, 3875443645, 50070184746, 929942357232, 22058196563695 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

COMMENTS

Same series for 1,1 2,1 2,2 3,0 3,1 4,2 4,3 5,3 polyhexes.

LINKS

Table of n, a(n) for n=5..21.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........0.1

..........0.0.1

.........1.1.1.0

........0.0.0.1.0

.......0.0.0.1.0.0

......0.1.1.0.0.0.1

.....1.1.0.0.1.0.1.0

....1.0.1.0.0.1.1.0.0

...0.0.0.1.0.0.0.1.1.0

CROSSREFS

Sequence in context: A155439 A155441 A155447 * A155409 A155406 A155352

Adjacent sequences:  A155337 A155338 A155339 * A155341 A155342 A155343

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 22 00:43 EDT 2019. Contains 326169 sequences. (Running on oeis4.)