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A154052
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 5.
0
0, 5, 8, 0, 2, 3, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0
OFFSET
5,2
COMMENTS
Pattern 1 0 0 starts at n=13 and continues through at least n=60.
EXAMPLE
Maximal zeros solution for n=13
..............1
.............0.0
............0.1.0
...........1.0.0.1
..........0.0.1.0.0
.........0.1.0.0.1.0
........1.0.0.1.0.0.1
.......0.0.1.0.0.1.0.0
......0.1.0.0.1.0.0.1.0
.....1.0.0.1.0.0.1.0.0.1
....0.0.1.0.0.1.0.0.1.0.0
...0.1.0.0.1.0.0.1.0.0.1.0
..1.0.0.1.0.0.1.0.0.1.0.0.1
CROSSREFS
Sequence in context: A249403 A201756 A242674 * A181439 A011496 A198360
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved