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A155448 Number of ways to place zero or more nonadjacent 2,0 3,1 4,2 4,3 4,4 5,2 6,2 7,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 61, 198, 925, 4932, 25307, 120759, 705438, 5070257, 44891211, 447175598, 4812407060, 57607358493 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

Table of n, a(n) for n=7..22.

EXAMPLE

Maximal 12 X 12 X 12 example

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

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

............0.0.1

...........0.0.1.0

..........1.1.1.0.0

.........0.0.0.1.0.0

........0.0.1.0.1.0.0

.......0.0.1.0.0.1.0.1

......0.0.1.0.0.0.0.1.0

.....1.1.1.0.1.1.1.1.0.0

....0.0.0.1.0.0.0.0.1.0.0

...0.0.0.0.1.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A098484 A155443 A155405 * A155446 A155372 A155373

Adjacent sequences:  A155445 A155446 A155447 * A155449 A155450 A155451

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified July 29 07:28 EDT 2021. Contains 346340 sequences. (Running on oeis4.)