A155383 - OEIS

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A155383

Number of ways to place zero or more nonadjacent 1,1 2,1 3,0 3,1 4,1 4,2 5,1 6,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 10, 19, 52, 161, 487, 1787, 8270, 41329, 223486, 1401458, 9925976, 78514707, 707922309, 7286793032

(list; graph; refs; listen; history; text; internal format)

OFFSET

6,2

LINKS

Table of n, a(n) for n=6..21.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........0.1.0

..........0.0.1.1

.........0.0.1.1.0

........0.1.0.0.1.0

.......0.1.0.0.0.1.0

......1.1.0.0.0.0.0.0

.....0.1.1.0.0.0.1.0.0

....0.1.0.0.1.1.1.1.1.1

...0.1.0.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A155322 A251176 A155428 * A155229 A155220 A300018

Adjacent sequences: A155380 A155381 A155382 * A155384 A155385 A155386

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved