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A154044
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 5.
0
20, 40, 40, 43, 35, 33, 18, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10
OFFSET
3,1
COMMENTS
Value 10 starts at n=12 and continues through at least n=60.
EXAMPLE
Maximal zeros solution for n=12
.............0
............0.0
...........1.3.1
..........1.0.0.1
.........1.0.2.0.1
........1.1.1.1.1.1
.......0.2.0.1.0.2.0
......1.0.1.1.1.1.0.1
.....2.1.1.0.2.0.1.1.2
....0.0.1.2.0.0.2.1.0.0
...0.2.1.0.0.3.0.0.1.2.0
..2.1.0.1.2.0.0.2.1.0.1.2
CROSSREFS
Sequence in context: A352108 A333234 A040380 * A235289 A296764 A046794
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved