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A154054
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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.
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0
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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; internal format)
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OFFSET
| 3,1
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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.
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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
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CROSSREFS
| Sequence in context: A078242 A108739 A072973 * A118219 A186681 A077679
Adjacent sequences: A154051 A154052 A154053 * A154055 A154056 A154057
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net) Jan 04 2009
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