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A155402 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,2 5,3 5,4 5,5 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 22, 40, 161, 580, 2088, 9630, 52661, 324848, 2048063, 15783536, 139241607, 1379819761 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..19.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........0.0

..........1.1.1

.........1.0.0.0

........1.0.1.1.1

.......1.0.0.0.0.1

......0.1.0.0.0.0.1

.....1.0.1.0.0.1.0.1

....0.1.0.0.0.1.0.1.0

...0.0.1.1.1.1.0.1.0.0

CROSSREFS

Sequence in context: A155382 A155287 A155337 * A155232 A188281 A227327

Adjacent sequences:  A155399 A155400 A155401 * A155403 A155404 A155405

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified February 25 21:28 EST 2021. Contains 341618 sequences. (Running on oeis4.)