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 A154055 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 3 X 3 X 3 subtriangle summing to 6. 0
 30, 67, 78, 94, 85, 83, 54, 55, 32, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,1 COMMENTS Pattern 35 32 35 29 38 29 starts at n=12 and continues through at least n=60. LINKS EXAMPLE Maximal zeros solution for n=12 .............3 ............0.0 ...........0.3.0 ..........3.0.0.3 .........0.0.3.0.0 ........0.3.0.0.3.0 .......3.0.0.3.0.0.3 ......0.0.3.0.0.3.0.0 .....0.3.0.0.3.0.0.3.0 ....3.0.0.3.0.0.3.0.0.3 ...0.0.3.0.0.3.0.0.3.0.0 ..0.3.0.0.3.0.0.3.0.0.3.0 CROSSREFS Sequence in context: A219543 A309393 A244341 * A270758 A241192 A064623 Adjacent sequences:  A154052 A154053 A154054 * A154056 A154057 A154058 KEYWORD nonn AUTHOR R. H. Hardin Jan 04 2009 STATUS approved

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Last modified January 19 01:11 EST 2021. Contains 340262 sequences. (Running on oeis4.)