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A154061
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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 5 X 5 X 5 subtriangle summing to 6.
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0
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300, 782, 945, 1120, 906, 954, 767, 352, 274, 247, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240
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OFFSET
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5,1
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COMMENTS
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Pattern 240 284 240 240 240 starts at n=15 and continues through at least n=59.
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LINKS
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Table of n, a(n) for n=5..57.
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EXAMPLE
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Maximal zeros solution for n=15
................2
...............0.0
..............0.2.0
.............0.0.0.0
............0.0.2.0.0
...........2.0.0.0.0.2
..........0.0.0.2.0.0.0
.........0.2.0.0.0.0.2.0
........0.0.0.0.2.0.0.0.0
.......0.0.2.0.0.0.0.2.0.0
......2.0.0.0.0.2.0.0.0.0.2
.....0.0.0.2.0.0.0.0.2.0.0.0
....0.2.0.0.0.0.2.0.0.0.0.2.0
...0.0.0.0.2.0.0.0.0.2.0.0.0.0
..0.0.2.0.0.0.0.2.0.0.0.0.2.0.0
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CROSSREFS
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Sequence in context: A250008 A332282 A190879 * A253650 A054026 A237773
Adjacent sequences: A154058 A154059 A154060 * A154062 A154063 A154064
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 04 2009
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STATUS
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approved
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