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 A154061 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 6. 0
 300, 782, 945, 1120, 906, 954, 767, 352, 274, 247, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240 (list; graph; refs; listen; history; text; internal format)
 OFFSET 5,1 COMMENTS Pattern 240 284 240 240 240 starts at n=15 and continues through at least n=59. LINKS EXAMPLE Maximal zeros solution for n=15 ................2 ...............0.0 ..............0.2.0 .............0.0.0.0 ............0.0.2.0.0 ...........2.0.0.0.0.2 ..........0.0.0.2.0.0.0 .........0.2.0.0.0.0.2.0 ........0.0.0.0.2.0.0.0.0 .......0.0.2.0.0.0.0.2.0.0 ......2.0.0.0.0.2.0.0.0.0.2 .....0.0.0.2.0.0.0.0.2.0.0.0 ....0.2.0.0.0.0.2.0.0.0.0.2.0 ...0.0.0.0.2.0.0.0.0.2.0.0.0.0 ..0.0.2.0.0.0.0.2.0.0.0.0.2.0.0 CROSSREFS Sequence in context: A102509 A250008 A190879 * A253650 A054026 A237773 Adjacent sequences:  A154058 A154059 A154060 * A154062 A154063 A154064 KEYWORD nonn AUTHOR R. H. Hardin Jan 04 2009 STATUS approved

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Last modified September 19 12:57 EDT 2019. Contains 327198 sequences. (Running on oeis4.)