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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; text; 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.

LINKS

Table of n, a(n) for n=3..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: A071160 A071153 A209644 * A073868 A215028 A292558

Adjacent sequences:  A154040 A154041 A154042 * A154044 A154045 A154046

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified November 14 04:44 EST 2019. Contains 329108 sequences. (Running on oeis4.)