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A154087
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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 12.
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0
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22, 40, 80, 53, 27, 67, 30, 17, 28, 9, 10, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6
(list; graph; refs; listen; history; internal format)
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OFFSET
| 5,1
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COMMENTS
| Pattern 6 9 9 9 9 starts at n=16 and continues through at least n=51.
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EXAMPLE
| Maximal zeros solution for n=16
.................6
................0.0
...............0.0.0
..............0.2.2.0
.............0.0.2.0.0
............4.1.0.0.1.4
...........0.1.0.2.0.1.0
..........0.0.0.2.2.0.0.0
.........0.2.2.0.0.0.2.2.0
........0.0.2.0.1.1.0.2.0.0
.......4.1.0.0.1.2.1.0.0.1.4
......0.1.0.2.0.1.1.0.2.0.1.0
.....0.0.0.2.2.0.0.0.2.2.0.0.0
....0.2.2.0.0.0.2.2.0.0.0.2.2.0
...0.0.2.0.1.1.0.2.0.1.1.0.2.0.0
..6.0.0.0.0.4.0.0.0.0.4.0.0.0.0.6
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CROSSREFS
| Sequence in context: A188156 A026061 A138040 * A063327 A066957 A118602
Adjacent sequences: A154084 A154085 A154086 * A154088 A154089 A154090
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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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