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A154068 Number of planar triangular n X n X n nonnegative integer grids symmetric both under 120 degree rotation and reflection with every similarly oriented 4 X 4 X 4 subtriangle summing to 8. 0
4, 15, 7, 13, 4, 8, 3, 4, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET
4,1
COMMENTS
Value 2 starts at n=16 and continues through at least n=60.
LINKS
EXAMPLE
Maximal zeros solution for n=16
.................2
................0.0
...............1.2.1
..............1.0.0.1
.............0.2.0.2.0
............2.0.1.1.0.2
...........0.0.2.0.2.0.0
..........1.2.1.0.0.1.2.1
.........1.0.0.1.2.1.0.0.1
........0.2.0.2.0.0.2.0.2.0
.......2.0.1.1.0.2.0.1.1.0.2
......0.0.2.0.2.0.0.2.0.2.0.0
.....1.2.1.0.0.1.2.1.0.0.1.2.1
....1.0.0.1.2.1.0.0.1.2.1.0.0.1
...0.2.0.2.0.0.2.0.2.0.0.2.0.2.0
..2.0.1.1.0.2.0.1.1.0.2.0.1.1.0.2
CROSSREFS
Sequence in context: A024547 A328839 A143899 * A309526 A126601 A284119
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved

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Last modified March 28 14:13 EDT 2024. Contains 371254 sequences. (Running on oeis4.)