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A155415 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,0 3,1 4,2 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 46, 127, 385, 1900, 9866, 51376, 316958, 2204777, 18653197, 179171339, 1914846570 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..19.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

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

..........0.1.0.1

.........1.1.0.1.0

........0.0.1.0.1.1

.......0.0.1.0.1.0.0

......1.0.0.1.0.1.0.0

.....0.1.1.0.0.1.0.0.0

....0.0.0.1.1.0.0.0.0.0

...0.0.0.1.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A330854 A268926 A212955 * A155273 A277613 A278403

Adjacent sequences:  A155412 A155413 A155414 * A155416 A155417 A155418

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified June 15 02:19 EDT 2021. Contains 345042 sequences. (Running on oeis4.)