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A300693
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a(n) = number of edges in a concertina n-cube.
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2
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OFFSET
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0,3
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COMMENTS
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n-place formulas in first-order logic like Ax Ey P(x, y) can be ordered by implication. This Hasse diagram has A000629(n) vertices and a(n) edges.
This is the second diagonal on the right in A300700, the triangle of faces in the concertina n-cube.
The corresponding sequence for cocoon concertina n-cubes, which have more internal vertices and edges, is A300694.
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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