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A155372 Number of ways to place zero or more nonadjacent 1,1 2,1 3,0 3,1 3,2 3,3 4,2 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 61, 206, 1719, 10790, 47817, 214975, 1559070, 18834488, 235320165, 2540394252, 29093246624, 443617991373, 9324012818913 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

COMMENTS

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

LINKS

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

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........0.1.0

.........1.1.1.1

........0.0.1.0.0

.......0.0.0.1.0.0

......1.0.1.0.0.0.1

.....0.1.1.0.1.1.1.0

....0.0.1.1.0.0.1.1.1

...0.0.1.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A155405 A155448 A155446 * A155373 A155444 A155439

Adjacent sequences:  A155369 A155370 A155371 * A155373 A155374 A155375

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified October 17 13:10 EDT 2021. Contains 348048 sequences. (Running on oeis4.)