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A154061
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.
0
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
OFFSET
5,1
COMMENTS
Pattern 240 284 240 240 240 starts at n=15 and continues through at least n=59.
EXAMPLE
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
CROSSREFS
Sequence in context: A332282 A190879 A375384 * A253650 A054026 A237773
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved