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

1, 1, 3, 14, 173, 16977, 17552169

Offset

0,3

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

Links

Table of n, a(n) for n=0..6.

Crossrefs

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

Sequence in context: A260995 A220438 A250001 * A366715 A132490 A344745

Adjacent sequences: A288556 A288557 A288558 * A288560 A288561 A288562

Keyword

nonn,more

Author

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

Extensions

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

Status

approved