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A153947
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Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 6 ones in any 4 X 4 X 4 subtriangle.
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0
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1, 2, 2, 4, 11, 23, 83, 542, 2154, 15035, 184615, 1315991, 16739106, 377984235, 5010747205, 118406407922, 4950057264228, 123458500863829
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OFFSET
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0,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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