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A155314 Number of ways to place zero or more nonadjacent 2,1 2,2 3,0 3,1 4,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 88, 640, 5031, 26752, 151436, 1596386, 24274062, 343210818, 4865294909, 96524596845, 2686621268327, 85799102830215 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

COMMENTS

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

LINKS

Table of n, a(n) for n=4..19.

EXAMPLE

Maximal 13 X 13 X 13 example

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

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

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

............0.1.1.0

...........0.1.0.0.0

..........0.0.0.0.0.1

.........0.0.0.0.1.0.1

........0.1.1.0.0.1.1.0

.......0.0.0.1.1.0.0.1.0

......0.0.1.1.0.0.1.0.0.1

.....1.1.0.0.0.1.1.0.1.0.1

....0.0.1.1.0.1.0.1.0.1.1.0

...0.1.1.0.0.0.0.1.0.0.0.1.0

CROSSREFS

Sequence in context: A237052 A155381 A155393 * A155321 A155425 A155410

Adjacent sequences:  A155311 A155312 A155313 * A155315 A155316 A155317

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 11 15:10 EDT 2022. Contains 356066 sequences. (Running on oeis4.)