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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 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.)