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A154040
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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 4 X 4 X 4 subtriangle summing to 4.
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0
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4, 11, 13, 16, 13, 6, 10, 4, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4
(list; graph; refs; listen; history; internal format)
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OFFSET
| 4,1
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COMMENTS
| Value 4 starts at n=13 and continues through at least n=55.
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EXAMPLE
| Maximal zeros solution for n=13
..............0
.............1.1
............0.1.0
...........0.0.0.1
..........1.0.1.0.0
.........0.0.1.1.0.0
........1.1.0.0.0.1.1
.......0.1.0.0.1.0.1.0
......0.0.0.1.1.0.0.0.1
.....1.0.1.0.0.1.0.1.0.0
....0.0.1.1.0.0.0.1.1.0.0
...1.1.0.0.0.1.1.0.0.0.1.1
..0.1.0.0.1.0.1.0.0.1.0.1.0
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CROSSREFS
| Sequence in context: A168212 A014449 A098060 * A066985 A095797 A205846
Adjacent sequences: A154037 A154038 A154039 * A154041 A154042 A154043
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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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