|
| |
|
|
A154043
|
|
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 5.
|
|
0
| |
|
|
0, 20, 12, 0, 28, 6, 0, 18, 6, 0, 9, 0, 0, 9, 0, 0, 7, 0, 0, 9, 0, 0, 9, 0, 0, 9, 0, 0, 7, 0, 0, 9, 0, 0, 9, 0, 0, 9, 0, 0, 7, 0, 0, 9, 0, 0, 9, 0, 0, 9, 0, 0, 7, 0, 0, 9, 0, 0
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 3,2
|
|
|
COMMENTS
| Pattern 0 9 0 0 9 0 0 7 0 0 9 0 starts at n=12 and continues through at least n=60.
|
|
|
EXAMPLE
| Maximal zeros solution for n=13
..............3
.............0.0
............0.2.0
...........1.1.1.1
..........2.0.1.0.2
.........0.1.1.1.1.0
........1.1.0.2.0.1.1
.......0.1.2.0.0.2.1.0
......2.1.0.0.3.0.0.1.2
.....1.0.1.2.0.0.2.1.0.1
....0.1.1.1.0.2.0.1.1.1.0
...0.2.1.0.1.1.1.1.0.1.2.0
..3.0.0.1.2.0.1.0.2.1.0.0.3
|
|
|
CROSSREFS
| Sequence in context: A058282 A071160 A071153 * A073868 A040382 A076119
Adjacent sequences: A154040 A154041 A154042 * A154044 A154045 A154046
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| R. H. Hardin (rhhardin(AT)att.net) Jan 04 2009
|
| |
|
|
