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A154076
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.
0
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
OFFSET
5,1
COMMENTS
Value 1 starts at n=15 and continues through at least n=56.
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
CROSSREFS
Sequence in context: A279426 A241120 A128342 * A275660 A088186 A089490
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved