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 A275923 #23 Jul 09 2025 04:41:47 %S A275923 1,1,2,11,156,16756 %N A275923 Number of connected arrangements of n circles in the affine plane, in the sense that the union of the solid circles is a connected set. %C A275923 Arrangements in A250001 that are connected (in the sense that the union of the solid circles is a connected set). See A250001, the main entry for this problem, for further information. %C A275923 Is this also 1 together with column 1 of A285996? - _Omar E. Pol_, May 28 2017 %H A275923 Jon Wild, <a href="/A275923/a275923.png">Figure showing relationship between A250001, A275923, A275924, and A288554 for n=3 circles</a> %Y A275923 Cf. A250001, A275924, A288554-A288568. %K A275923 nonn,more %O A275923 0,3 %A A275923 _N. J. A. Sloane_, Aug 29 2016, based on information supplied by _Jon Wild_ %E A275923 a(5) from _Jon Wild_, Aug 31 2016