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A155367 Number of ways to place zero or more nonadjacent (0,0) (1,0) (1,1) (2,0) (3,1) (4,0) (4,1) (5,1) polyhexes in any orientation on a planar n X n X n triangular grid. 0
1, 7, 19, 37, 209, 927, 3227, 19783, 150961, 985335, 8837609, 101553731, 1116357221, 14988545712 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

COMMENTS

Same series for (1,0) (1,1) (2,0) (3,0) (3,1) (4,1) (5,0) (5,1) polyhexes.

LINKS

Table of n, a(n) for n=5..18.

EXAMPLE

Maximal 9 X 9 X 9 example:

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

..........1.1

.........0.1.0

........1.1.0.1

.......1.0.0.1.1

......1.1.0.0.0.1

.....0.0.0.0.0.1.0

....1.0.1.1.1.0.1.1

...1.1.1.0.1.0.0.1.0

CROSSREFS

Sequence in context: A155364 A155332 A155388 * A155357 A155248 A027452

Adjacent sequences:  A155364 A155365 A155366 * A155368 A155369 A155370

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 22 2009

STATUS

approved

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Last modified October 18 06:50 EDT 2021. Contains 348066 sequences. (Running on oeis4.)