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 A300694 a(n) = number of edges in a cocoon concertina n-cube. 1
 0, 1, 13, 139, 1605, 20741 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS n-place formulas in first-order logic like Ax Ey P(x, y) or Ex P(x, x) can be ordered by implication. This Hasse diagram has A300696(n) vertices and a(n) edges. The corresponding sequence for convex concertina n-cubes is A300693. LINKS Tilman Piesk, Formulas in predicate logic (Wikiversity) Tilman Piesk, Image of a cocoon concertina square with 13 edges Tilman Piesk, Lists of edges for n=2..5 Tilman Piesk, Python code used to generate the sequence EXAMPLE The cocoon concertina square has the A300693(2) = 6 outer and 7 inner edges, giving a(n) = 13 in total. CROSSREFS Cf. A300696, A300693. Sequence in context: A241631 A125425 A016145 * A193708 A195464 A064103 Adjacent sequences:  A300691 A300692 A300693 * A300695 A300696 A300697 KEYWORD nonn,more AUTHOR Tilman Piesk, Mar 24 2018 STATUS approved

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Last modified October 19 03:34 EDT 2019. Contains 328211 sequences. (Running on oeis4.)