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A154041 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 4 X 4 X 4 subtriangle summing to 4. 0
27, 96, 52, 70, 23, 27, 16, 15, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

COMMENTS

Value 8 starts at n=12 and continues through at least n=60.

LINKS

Table of n, a(n) for n=4..60.

EXAMPLE

Maximal zeros solution for n=12

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

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

...........0.2.0

..........0.0.0.0

.........0.0.2.0.0

........2.0.0.0.0.2

.......0.0.0.2.0.0.0

......0.2.0.0.0.0.2.0

.....0.0.0.0.2.0.0.0.0

....0.0.2.0.0.0.0.2.0.0

...2.0.0.0.0.2.0.0.0.0.2

..0.0.0.2.0.0.0.0.2.0.0.0

CROSSREFS

Sequence in context: A226359 A078183 A072252 * A233156 A118615 A197619

Adjacent sequences:  A154038 A154039 A154040 * A154042 A154043 A154044

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified December 16 09:06 EST 2019. Contains 330020 sequences. (Running on oeis4.)