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A155446 Number of ways to place zero or more nonadjacent 2,0 3,1 3,2 4,1 4,3 4,4 5,2 6,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 61, 198, 961, 7036, 35739, 164475, 1020808, 9067997, 101564763, 1167745653, 13478588062, 184107863480, 3150709806656, 65431262534013 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..23.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........1.0.0

..........0.1.1.0

.........0.1.0.1.1

........0.0.1.0.0.0

.......1.0.1.0.1.0.0

......0.1.0.0.0.1.1.0

.....0.1.0.1.1.0.0.1.1

....0.0.1.1.0.0.1.1.0.0

...0.0.1.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A155443 A155405 A155448 * A155372 A155373 A155444

Adjacent sequences:  A155443 A155444 A155445 * A155447 A155448 A155449

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified November 29 12:24 EST 2021. Contains 349416 sequences. (Running on oeis4.)