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A154037 Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 3 X 3 X 3 subtriangle summing to 4. 0
0, 14, 8, 0, 29, 0, 0, 33, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

COMMENTS

Pattern 0 0 27 starts at n=11 and continues through at least n=60.

LINKS

Table of n, a(n) for n=3..60.

EXAMPLE

Maximal zeros solution for n=13

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

.............0.2

............2.0.0

...........0.0.2.0

..........0.2.0.0.2

.........2.0.0.2.0.0

........0.0.2.0.0.2.0

.......0.2.0.0.2.0.0.2

......2.0.0.2.0.0.2.0.0

.....0.0.2.0.0.2.0.0.2.0

....0.2.0.0.2.0.0.2.0.0.2

...2.0.0.2.0.0.2.0.0.2.0.0

..0.0.2.0.0.2.0.0.2.0.0.2.0

CROSSREFS

Sequence in context: A040185 A033964 A275337 * A248600 A240245 A119871

Adjacent sequences:  A154034 A154035 A154036 * A154038 A154039 A154040

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified August 25 21:00 EDT 2019. Contains 326324 sequences. (Running on oeis4.)