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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A288562 Number of arrangements of n pseudo-circles in the affine plane with the property that every pseudo-circle intersects all the other circles.

Original entry on oeis.org

1, 1, 1, 4, 45, 5108, 4598809
Offset: 0

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Author

N. J. A. Sloane, Jun 12 2017, based on information supplied by Jon Wild on Aug 31 2016

Keywords

Comments

Arrangements in A288559 that are connected, with the property that every pseudo-circle intersects all the other pseudo-circles.
These counts have been reduced for mirror symmetry.
See A250001, the main entry for this problem, for further information.

Crossrefs

Cf. A250001, A275923, A275924, A288554-A288568.

Extensions

a(6) from Manfred Scheucher, May 09 2018

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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