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 A154068 Number of planar triangular n X n X n nonnegative integer grids symmetric both under 120 degree rotation and reflection with every similarly oriented 4 X 4 X 4 subtriangle summing to 8. 0
 4, 15, 7, 13, 4, 8, 3, 4, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,1 COMMENTS Value 2 starts at n=16 and continues through at least n=60. LINKS Table of n, a(n) for n=4..60. EXAMPLE Maximal zeros solution for n=16 .................2 ................0.0 ...............1.2.1 ..............1.0.0.1 .............0.2.0.2.0 ............2.0.1.1.0.2 ...........0.0.2.0.2.0.0 ..........1.2.1.0.0.1.2.1 .........1.0.0.1.2.1.0.0.1 ........0.2.0.2.0.0.2.0.2.0 .......2.0.1.1.0.2.0.1.1.0.2 ......0.0.2.0.2.0.0.2.0.2.0.0 .....1.2.1.0.0.1.2.1.0.0.1.2.1 ....1.0.0.1.2.1.0.0.1.2.1.0.0.1 ...0.2.0.2.0.0.2.0.2.0.0.2.0.2.0 ..2.0.1.1.0.2.0.1.1.0.2.0.1.1.0.2 CROSSREFS Sequence in context: A024547 A328839 A143899 * A309526 A126601 A284119 Adjacent sequences: A154065 A154066 A154067 * A154069 A154070 A154071 KEYWORD nonn AUTHOR R. H. Hardin Jan 04 2009 STATUS approved

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Last modified June 5 05:23 EDT 2023. Contains 363130 sequences. (Running on oeis4.)