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 A288555 #15 Jul 09 2025 04:43:41 %S A288555 1,1,3,14,200 %N A288555 Number of one-sided arrangements of n circles in the affine plane. %C A288555 These counts are not reduced for mirror symmetry. %C A288555 See A250001, the main entry for this problem, for further information. %Y A288555 Cf. A250001, A275923, A275924, A288554-A288568. %K A288555 nonn,more %O A288555 0,3 %A A288555 _N. J. A. Sloane_, Jun 13 2017, based on information supplied by _Jon Wild_ on Aug 31 2016