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A154054 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 6. 0
3, 30, 17, 20, 88, 16, 18, 110, 28, 14, 82, 12, 28, 76, 12, 12, 86, 12, 12, 76, 28, 12, 76, 12, 28, 76, 12, 12, 86, 12, 12, 76, 28, 12, 76, 12, 28, 76, 12, 12, 86, 12, 12, 76, 28, 12, 76, 12, 28, 76, 12, 12, 86, 12, 12, 76, 28, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

COMMENTS

Pattern 12 28 76 12 12 86 12 12 76 28 12 76 starts at n=14 and continues through at least n=60.

LINKS

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

EXAMPLE

Maximal zeros solution for n=14

...............2

..............2.2

.............0.0.0

............0.2.2.0

...........2.0.2.0.2

..........2.2.0.0.2.2

.........0.0.0.4.0.0.0

........0.2.2.0.0.2.2.0

.......2.0.2.0.2.0.2.0.2

......2.2.0.0.2.2.0.0.2.2

.....0.0.0.4.0.0.0.4.0.0.0

....0.2.2.0.0.2.2.0.0.2.2.0

...2.0.2.0.2.0.2.0.2.0.2.0.2

..2.2.0.0.2.2.0.0.2.2.0.0.2.2

CROSSREFS

Sequence in context: A078242 A108739 A072973 * A118219 A186681 A295430

Adjacent sequences:  A154051 A154052 A154053 * A154055 A154056 A154057

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified January 26 16:30 EST 2021. Contains 340442 sequences. (Running on oeis4.)