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A153923
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Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation 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, 723, 3847, 12686, 64066, 522788, 2375205, 17429033, 207659953, 1416380562, 15388271829, 267002004687, 2673537774503, 42803194029689, 1082510269366192
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refs;
listen;
history;
text;
internal format)
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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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