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A155443 Number of ways to place zero or more nonadjacent 2,1 3,0 3,1 4,2 4,3 4,4 5,2 6,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 61, 156, 946, 6587, 32063, 128930, 679319, 5663620, 64380331, 713842124, 7200710477, 81450733059, 1198927050536 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..22.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

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

..........0.0.1.1

.........1.1.1.0.0

........0.0.0.1.0.0

.......0.0.1.0.1.0.1

......1.0.1.0.0.0.1.0

.....0.1.1.0.1.1.1.0.0

....0.1.0.1.0.0.0.1.1.0

...0.0.0.0.1.0.0.1.0.0.0

CROSSREFS

Sequence in context: A133323 A002407 A098484 * A155405 A155448 A155446

Adjacent sequences:  A155440 A155441 A155442 * A155444 A155445 A155446

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified January 21 09:14 EST 2022. Contains 350475 sequences. (Running on oeis4.)