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A270579
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The number of sets of parallel planes into which the planes defined in A270578 fall.
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1
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OFFSET
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2,1
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LINKS
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EXAMPLE
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The 20 planes defined by the points of the 2 X 2 X 2 grid fall into 13 families of parallel planes: 3 parallel to the faces, 4 perpendicular to the space diagonals and 6 which are the planes defined by an edge and its opposite edge. So a(2)=13.
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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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