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 A154035 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 5 X 5 X 5 subtriangle summing to 3. 0
 28, 42, 30, 16, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 5,1 COMMENTS Value 1 starts at n=11 and continues through at least n=60. LINKS EXAMPLE Maximal zeros solution for n=11 ............1 ...........0.0 ..........0.1.0 .........0.0.0.0 ........0.0.1.0.0 .......1.0.0.0.0.1 ......0.0.0.1.0.0.0 .....0.1.0.0.0.0.1.0 ....0.0.0.0.1.0.0.0.0 ...0.0.1.0.0.0.0.1.0.0 ..1.0.0.0.0.1.0.0.0.0.1 CROSSREFS Sequence in context: A047630 A135789 A219882 * A025368 A025359 A056031 Adjacent sequences:  A154032 A154033 A154034 * A154036 A154037 A154038 KEYWORD nonn AUTHOR R. H. Hardin Jan 04 2009 STATUS approved

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Last modified December 1 22:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)