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A154055
Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 3 X 3 X 3 subtriangle summing to 6.
0
30, 67, 78, 94, 85, 83, 54, 55, 32, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35
OFFSET
3,1
COMMENTS
Pattern 35 32 35 29 38 29 starts at n=12 and continues through at least n=60.
EXAMPLE
Maximal zeros solution for n=12
.............3
............0.0
...........0.3.0
..........3.0.0.3
.........0.0.3.0.0
........0.3.0.0.3.0
.......3.0.0.3.0.0.3
......0.0.3.0.0.3.0.0
.....0.3.0.0.3.0.0.3.0
....3.0.0.3.0.0.3.0.0.3
...0.0.3.0.0.3.0.0.3.0.0
..0.3.0.0.3.0.0.3.0.0.3.0
CROSSREFS
Sequence in context: A157346 A219543 A309393 * A270758 A241192 A359545
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved