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A155407 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,1 3,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 22, 49, 162, 562, 3016, 16877, 98214, 637805, 5164375, 49219867, 557800561, 7204177132, 106101558795 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..19.

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........0.1

.........1.1.0

........0.1.1.0

.......1.1.0.0.1

......0.0.0.0.1.0

.....0.1.0.0.0.1.1

....1.1.1.1.0.1.1.0

...1.0.1.0.1.0.0.1.1

CROSSREFS

Sequence in context: A178452 A324536 A137247 * A318416 A124697 A155426

Adjacent sequences:  A155404 A155405 A155406 * A155408 A155409 A155410

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 9 07:42 EDT 2022. Contains 356019 sequences. (Running on oeis4.)