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A154059
Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 4 X 4 X 4 subtriangle summing to 6.
0
5005, 42379, 161481, 327971, 465436, 588412, 315265, 126740, 40993, 9833, 4891, 3523, 2084, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080
OFFSET
4,1
COMMENTS
Value 2080 starts at n=17 and continues through at least n=50.
EXAMPLE
Maximal zeros solution for n=17
..................0
.................0.0
................0.0.3
...............0.3.0.0
..............3.0.0.0.0
.............0.0.0.0.3.0
............0.0.0.3.0.0.0
...........0.0.3.0.0.0.0.3
..........0.3.0.0.0.0.3.0.0
.........3.0.0.0.0.3.0.0.0.0
........0.0.0.0.3.0.0.0.0.3.0
.......0.0.0.3.0.0.0.0.3.0.0.0
......0.0.3.0.0.0.0.3.0.0.0.0.3
.....0.3.0.0.0.0.3.0.0.0.0.3.0.0
....3.0.0.0.0.3.0.0.0.0.3.0.0.0.0
...0.0.0.0.3.0.0.0.0.3.0.0.0.0.3.0
..0.0.0.3.0.0.0.0.3.0.0.0.0.3.0.0.0
CROSSREFS
Sequence in context: A280879 A067226 A249081 * A138637 A140921 A295459
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved