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A153994
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Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 11 ones in any 5 X 5 X 5 subtriangle.
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0
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1, 2, 2, 4, 16, 26, 114, 913, 3227, 25373, 441919, 3146641, 49361868, 1683721022, 23850420259, 734273471828, 49324500595954, 1380740815171041
(list; graph; refs; listen; history; internal format)
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