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.
%I A288559 #21 Jul 09 2025 04:44:01 %S A288559 1,1,3,14,173,16977,17552169 %N A288559 Number of arrangements of n pseudo-circles in the affine plane. %C A288559 These counts have been reduced for mirror symmetry. %C A288559 See A250001, the main entry for this problem, for further information. %C A288559 This sequence is also an upper bound for A250001. - _Andrii Shportko_, Jun 03 2025 %Y A288559 Cf. A250001, A275923, A275924, A288554-A288568. %K A288559 nonn,more %O A288559 0,3 %A A288559 _N. J. A. Sloane_, Jun 13 2017, based on information supplied by _Jon Wild_ on Aug 31 2016 %E A288559 After consulting with _Jon Wild_, a(6) added by _Andrii Shportko_, Jun 03 2025