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A153528
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Number of planar n X n X n binary triangular grids with no more than 3 ones in any 4 X 4 X 4 subtriangle.
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0
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1, 2, 8, 42, 176, 1656, 25535, 536768, 14123143, 595925622, 38030336629, 3481512865400, 454136719811653, 87600895347244742
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