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A154076
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Number of planar triangular n X n X n nonnegative integer grids symmetric both under 120 degree rotation and reflection with every similarly oriented 5 X 5 X 5 subtriangle summing to 9.
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0
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13, 19, 34, 21, 7, 16, 7, 1, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 5,1
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COMMENTS
| Value 1 starts at n=15 and continues through at least n=56.
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EXAMPLE
| Maximal zeros solution for n=15
................1
...............0.0
..............1.1.1
.............0.1.1.0
............1.0.1.0.1
...........1.1.0.0.1.1
..........0.0.0.3.0.0.0
.........1.1.1.0.0.1.1.1
........0.1.1.0.1.0.1.1.0
.......1.0.1.0.1.1.0.1.0.1
......1.1.0.0.1.1.1.0.0.1.1
.....0.0.0.3.0.0.0.0.3.0.0.0
....1.1.1.0.0.1.1.1.0.0.1.1.1
...0.1.1.0.1.0.1.1.0.1.0.1.1.0
..1.0.1.0.1.1.0.1.0.1.1.0.1.0.1
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CROSSREFS
| Sequence in context: A101408 A023252 A128342 * A088186 A089490 A057749
Adjacent sequences: A154073 A154074 A154075 * A154077 A154078 A154079
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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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