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A154051
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 5.
0
144, 321, 322, 328, 186, 123, 89, 49, 37, 31, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27
OFFSET
5,1
COMMENTS
Value 27 starts at n=15 and continues through at least n=60.
EXAMPLE
Maximal zeros solution for n=15
................2
...............0.0
..............0.2.0
.............0.0.0.0
............0.0.1.0.0
...........0.0.1.1.0.0
..........2.0.0.0.0.0.2
.........0.0.0.1.1.0.0.0
........0.2.0.0.0.0.0.2.0
.......0.0.0.0.1.1.0.0.0.0
......0.0.1.0.0.1.0.0.1.0.0
.....0.0.1.1.0.0.0.0.1.1.0.0
....2.0.0.0.0.0.2.0.0.0.0.0.2
...0.0.0.1.1.0.0.0.0.1.1.0.0.0
..0.2.0.0.0.0.0.2.0.0.0.0.0.2.0
CROSSREFS
Sequence in context: A134341 A125841 A320457 * A335543 A366854 A217584
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved