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A154046 Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 4 X 4 X 4 subtriangle summing to 5. +0
1
4, 14, 23, 19, 11, 38, 9, 12, 11, 4, 7, 10, 7, 4, 7, 10, 7, 4, 7, 10, 7, 4, 7, 10, 7, 4, 7, 10, 7, 4, 7, 10, 7, 4, 7, 10, 7, 4, 7, 10, 7, 4, 7, 10, 7, 4, 7, 10, 7, 4, 7, 10, 7, 4, 7, 10, 7 (list; graph; listen)
OFFSET

4,1

COMMENT

Pattern 4 7 10 7 starts at n=13 and continues through at least n=60.

EXAMPLE

Maximal zeros solution for n=13

..............2

.............0.0

............0.1.0

...........0.1.1.0

..........2.0.0.0.2

.........0.0.1.1.0.0

........0.1.0.1.0.1.0

.......0.1.1.0.0.1.1.0

......2.0.0.0.2.0.0.0.2

.....0.0.1.1.0.0.1.1.0.0

....0.1.0.1.0.1.0.1.0.1.0

...0.1.1.0.0.1.1.0.0.1.1.0

..2.0.0.0.2.0.0.0.2.0.0.0.2

CROSSREFS

Sequence in context: A051806 A034051 A044437 this_sequence A000054 A063616 A031254

Adjacent sequences: A154043 A154044 A154045 this_sequence A154047 A154048 A154049

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 04 2009

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.


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