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 A154031 Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 4 X 4 X 4 subtriangle summing to 2. 0
 55, 118, 138, 97, 37, 21, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,1 COMMENTS Value 15 starts at n=10 and continues through at least n=60. LINKS EXAMPLE Maximal zeros solution for n=10 ...........0 ..........0.0 .........0.0.1 ........0.1.0.0 .......1.0.0.0.0 ......0.0.0.0.1.0 .....0.0.0.1.0.0.0 ....0.0.1.0.0.0.0.1 ...0.1.0.0.0.0.1.0.0 ..1.0.0.0.0.1.0.0.0.0 CROSSREFS Sequence in context: A275124 A282768 A217429 * A044242 A044623 A063345 Adjacent sequences:  A154028 A154029 A154030 * A154032 A154033 A154034 KEYWORD nonn AUTHOR R. H. Hardin Jan 04 2009 STATUS approved

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Last modified June 18 20:45 EDT 2021. Contains 345121 sequences. (Running on oeis4.)