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A154040 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 4. 0
4, 11, 13, 16, 13, 6, 10, 4, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

COMMENTS

Value 4 starts at n=13 and continues through at least n=55.

LINKS

Table of n, a(n) for n=4..55.

EXAMPLE

Maximal zeros solution for n=13

..............0

.............1.1

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

...........0.0.0.1

..........1.0.1.0.0

.........0.0.1.1.0.0

........1.1.0.0.0.1.1

.......0.1.0.0.1.0.1.0

......0.0.0.1.1.0.0.0.1

.....1.0.1.0.0.1.0.1.0.0

....0.0.1.1.0.0.0.1.1.0.0

...1.1.0.0.0.1.1.0.0.0.1.1

..0.1.0.0.1.0.1.0.0.1.0.1.0

CROSSREFS

Sequence in context: A268232 A285633 A266281 * A066985 A228003 A347561

Adjacent sequences:  A154037 A154038 A154039 * A154041 A154042 A154043

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified May 15 23:51 EDT 2022. Contains 353687 sequences. (Running on oeis4.)