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A153932
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Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 4 ones in any 4 X 4 X 4 subtriangle.
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0
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1, 2, 2, 3, 8, 13, 39, 225, 564, 2858, 24012, 101231, 758165, 10608857, 69903886, 854166606, 19155776749, 207379552763, 4126912621572
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