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 A154037 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 4. 0
 0, 14, 8, 0, 29, 0, 0, 33, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0, 27, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,2 COMMENTS Pattern 0 0 27 starts at n=11 and continues through at least n=60. LINKS EXAMPLE Maximal zeros solution for n=13 ..............0 .............0.2 ............2.0.0 ...........0.0.2.0 ..........0.2.0.0.2 .........2.0.0.2.0.0 ........0.0.2.0.0.2.0 .......0.2.0.0.2.0.0.2 ......2.0.0.2.0.0.2.0.0 .....0.0.2.0.0.2.0.0.2.0 ....0.2.0.0.2.0.0.2.0.0.2 ...2.0.0.2.0.0.2.0.0.2.0.0 ..0.0.2.0.0.2.0.0.2.0.0.2.0 CROSSREFS Sequence in context: A040185 A033964 A275337 * A248600 A240245 A119871 Adjacent sequences:  A154034 A154035 A154036 * A154038 A154039 A154040 KEYWORD nonn AUTHOR R. H. Hardin Jan 04 2009 STATUS approved

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Last modified August 25 21:00 EDT 2019. Contains 326324 sequences. (Running on oeis4.)