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A153991
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Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 10 ones in any 5 X 5 X 5 subtriangle.
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0
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1, 2, 2, 4, 16, 26, 107, 826, 3054, 23077, 376116, 2691940, 40600759, 1272412451, 17792826487, 517514558991, 31410446834698
(list; graph; refs; listen; history; internal format)
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