

A154054


Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 3 X 3 X 3 subtriangle summing to 6.


0



3, 30, 17, 20, 88, 16, 18, 110, 28, 14, 82, 12, 28, 76, 12, 12, 86, 12, 12, 76, 28, 12, 76, 12, 28, 76, 12, 12, 86, 12, 12, 76, 28, 12, 76, 12, 28, 76, 12, 12, 86, 12, 12, 76, 28, 12, 76, 12, 28, 76, 12, 12, 86, 12, 12, 76, 28, 12
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

3,1


COMMENTS

Pattern 12 28 76 12 12 86 12 12 76 28 12 76 starts at n=14 and continues through at least n=60.


LINKS



EXAMPLE

Maximal zeros solution for n=14
...............2
..............2.2
.............0.0.0
............0.2.2.0
...........2.0.2.0.2
..........2.2.0.0.2.2
.........0.0.0.4.0.0.0
........0.2.2.0.0.2.2.0
.......2.0.2.0.2.0.2.0.2
......2.2.0.0.2.2.0.0.2.2
.....0.0.0.4.0.0.0.4.0.0.0
....0.2.2.0.0.2.2.0.0.2.2.0
...2.0.2.0.2.0.2.0.2.0.2.0.2
..2.2.0.0.2.2.0.0.2.2.0.0.2.2


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



