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A154044
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Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 3 X 3 X 3 subtriangle summing to 5.
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0
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20, 40, 40, 43, 35, 33, 18, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,1
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COMMENTS
| Value 10 starts at n=12 and continues through at least n=60.
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EXAMPLE
| Maximal zeros solution for n=12
.............0
............0.0
...........1.3.1
..........1.0.0.1
.........1.0.2.0.1
........1.1.1.1.1.1
.......0.2.0.1.0.2.0
......1.0.1.1.1.1.0.1
.....2.1.1.0.2.0.1.1.2
....0.0.1.2.0.0.2.1.0.0
...0.2.1.0.0.3.0.0.1.2.0
..2.1.0.1.2.0.0.2.1.0.1.2
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CROSSREFS
| Sequence in context: A132606 A054288 A040380 * A046794 A104153 A049057
Adjacent sequences: A154041 A154042 A154043 * A154045 A154046 A154047
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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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