

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
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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



