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A155237 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 45, 176, 869, 4190, 28277, 212331, 2073991, 22977026, 311395472, 4817775687 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..16.

EXAMPLE

Maximal 13 X 13 X 13 example

...............1

..............0.1

.............1.0.1

............1.0.0.1

...........1.0.1.0.1

..........1.0.0.1.0.0

.........1.0.1.0.1.0.1

........0.0.1.0.0.1.0.1

.......1.0.1.0.0.0.1.0.1

......1.0.1.0.0.0.0.0.0.1

.....1.0.1.0.1.1.1.1.1.0.1

....1.0.0.0.0.0.0.0.0.0.0.0

...1.0.1.1.1.1.1.0.1.1.1.1.1

CROSSREFS

Sequence in context: A155386 A155330 A155278 * A155223 A155219 A153985

Adjacent sequences: A155234 A155235 A155236 * A155238 A155239 A155240

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified February 6 11:45 EST 2023. Contains 360104 sequences. (Running on oeis4.)