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 A154054 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 6. 0
 3, 30, 17, 20, 88, 16, 18, 110, 28, 14, 82, 12, 28, 76, 12, 12, 86, 12, 12, 76, 28, 12, 76, 12, 28, 76, 12, 12, 86, 12, 12, 76, 28, 12, 76, 12, 28, 76, 12, 12, 86, 12, 12, 76, 28, 12, 76, 12, 28, 76, 12, 12, 86, 12, 12, 76, 28, 12 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,1 COMMENTS Pattern 12 28 76 12 12 86 12 12 76 28 12 76 starts at n=14 and continues through at least n=60. LINKS Table of n, a(n) for n=3..60. EXAMPLE Maximal zeros solution for n=14 ...............2 ..............2.2 .............0.0.0 ............0.2.2.0 ...........2.0.2.0.2 ..........2.2.0.0.2.2 .........0.0.0.4.0.0.0 ........0.2.2.0.0.2.2.0 .......2.0.2.0.2.0.2.0.2 ......2.2.0.0.2.2.0.0.2.2 .....0.0.0.4.0.0.0.4.0.0.0 ....0.2.2.0.0.2.2.0.0.2.2.0 ...2.0.2.0.2.0.2.0.2.0.2.0.2 ..2.2.0.0.2.2.0.0.2.2.0.0.2.2 CROSSREFS Sequence in context: A078242 A108739 A072973 * A118219 A186681 A295430 Adjacent sequences: A154051 A154052 A154053 * A154055 A154056 A154057 KEYWORD nonn AUTHOR R. H. Hardin Jan 04 2009 STATUS approved

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Last modified September 29 12:40 EDT 2023. Contains 365771 sequences. (Running on oeis4.)