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A296406
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Number of non-isomorphic arrangements of n pairwise intersecting pseudo-circles on a sphere, reduced for mirror symmetry.
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8
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OFFSET
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0,4
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COMMENTS
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The list of arrangements is available online on the Homepage of Pseudocircles (see below) and a detailed description for the enumeration can be found in Arrangements of Pseudocircles: On Circularizability (see below).
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LINKS
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FORMULA
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a(n) = 2^(\Theta(n^2)). (cf. Arrangements of Pseudocircles: On Circularizability)
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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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