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A154095 Number of planar triangular n X n X n nonnegative integer grids symmetric both under 120 degree rotation and reflection with every similarly oriented 5 X 5 X 5 subtriangle summing to 15. 0
34, 71, 166, 99, 63, 160, 77, 49, 77, 38, 24, 64, 20, 26, 24, 20, 21, 32, 18, 20 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,1

LINKS

Table of n, a(n) for n=5..24.

EXAMPLE

Maximal zeros solution for n=20

.....................3

....................3.3

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

..................0.0.0.0

.................0.1.3.1.0

................0.0.3.3.0.0

...............3.1.0.1.0.1.3

..............3.3.0.0.0.0.3.3

.............0.1.0.1.3.1.0.1.0

............0.0.0.0.3.3.0.0.0.0

...........0.1.3.1.0.1.0.1.3.1.0

..........0.0.3.3.0.0.0.0.3.3.0.0

.........3.1.0.1.0.1.3.1.0.1.0.1.3

........3.3.0.0.0.0.3.3.0.0.0.0.3.3

.......0.1.0.1.3.1.0.1.0.1.3.1.0.1.0

......0.0.0.0.3.3.0.0.0.0.3.3.0.0.0.0

.....0.1.3.1.0.1.0.1.3.1.0.1.0.1.3.1.0

....0.0.3.3.0.0.0.0.3.3.0.0.0.0.3.3.0.0

...3.1.0.1.0.1.3.1.0.1.0.1.3.1.0.1.0.1.3

..3.3.0.0.0.0.3.3.0.0.0.0.3.3.0.0.0.0.3.3

CROSSREFS

Sequence in context: A044517 A063333 A079863 * A184066 A277449 A063533

Adjacent sequences:  A154092 A154093 A154094 * A154096 A154097 A154098

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified March 31 19:37 EDT 2020. Contains 333151 sequences. (Running on oeis4.)