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A155444 Number of ways to place zero or more nonadjacent 2,0 3,0 4,1 4,2 4,3 4,4 5,1 6,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 61, 215, 976, 6510, 31895, 148311, 835105, 6965183, 70259384, 771053702, 8287139754, 101882179551 (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

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

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

..........1.0.0.0

.........0.1.1.1.1

........0.1.0.0.0.0

.......1.0.1.0.1.0.0

......0.1.0.0.0.1.0.0

.....0.0.1.0.1.0.1.0.1

....0.0.0.1.1.0.0.1.1.0

...0.0.1.1.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A155446 A155372 A155373 * A155439 A155441 A155447

Adjacent sequences:  A155441 A155442 A155443 * A155445 A155446 A155447

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.)