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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.

A288559 Number of arrangements of n pseudo-circles in the affine plane.

Original entry on oeis.org

1, 1, 3, 14, 173, 16977, 17552169
Offset: 0

Views

Author

N. J. A. Sloane, Jun 13 2017, based on information supplied by Jon Wild on Aug 31 2016

Keywords

Comments

These counts have been reduced for mirror symmetry.
See A250001, the main entry for this problem, for further information.
This sequence is also an upper bound for A250001. - Andrii Shportko, Jun 03 2025

Crossrefs

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

Extensions

After consulting with Jon Wild, a(6) added by Andrii Shportko, Jun 03 2025

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

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