

A154037


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 4.


0



0, 14, 8, 0, 29, 0, 0, 33, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0
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OFFSET

3,2


COMMENTS

Pattern 0 0 27 starts at n=11 and continues through at least n=60.


LINKS

Table of n, a(n) for n=3..60.


EXAMPLE

Maximal zeros solution for n=13
..............0
.............0.2
............2.0.0
...........0.0.2.0
..........0.2.0.0.2
.........2.0.0.2.0.0
........0.0.2.0.0.2.0
.......0.2.0.0.2.0.0.2
......2.0.0.2.0.0.2.0.0
.....0.0.2.0.0.2.0.0.2.0
....0.2.0.0.2.0.0.2.0.0.2
...2.0.0.2.0.0.2.0.0.2.0.0
..0.0.2.0.0.2.0.0.2.0.0.2.0


CROSSREFS

Sequence in context: A040185 A033964 A275337 * A248600 A240245 A119871
Adjacent sequences: A154034 A154035 A154036 * A154038 A154039 A154040


KEYWORD

nonn


AUTHOR

R. H. Hardin Jan 04 2009


STATUS

approved



