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 A154040 Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 4 X 4 X 4 subtriangle summing to 4. 0
 4, 11, 13, 16, 13, 6, 10, 4, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,1 COMMENTS Value 4 starts at n=13 and continues through at least n=55. LINKS EXAMPLE Maximal zeros solution for n=13 ..............0 .............1.1 ............0.1.0 ...........0.0.0.1 ..........1.0.1.0.0 .........0.0.1.1.0.0 ........1.1.0.0.0.1.1 .......0.1.0.0.1.0.1.0 ......0.0.0.1.1.0.0.0.1 .....1.0.1.0.0.1.0.1.0.0 ....0.0.1.1.0.0.0.1.1.0.0 ...1.1.0.0.0.1.1.0.0.0.1.1 ..0.1.0.0.1.0.1.0.0.1.0.1.0 CROSSREFS Sequence in context: A268232 A285633 A266281 * A066985 A228003 A347561 Adjacent sequences:  A154037 A154038 A154039 * A154041 A154042 A154043 KEYWORD nonn AUTHOR R. H. Hardin Jan 04 2009 STATUS approved

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Last modified May 15 23:51 EDT 2022. Contains 353687 sequences. (Running on oeis4.)