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 A275924 #18 Jul 09 2025 04:41:55 %S A275924 1,1,1,6,112,15502 %N A275924 Number of connected arrangements of n circles in the affine plane, in the sense that the union of the boundaries of the circles is a connected set. %C A275924 Arrangements in A250001 that are connected, in the sense that the union of the (boundaries of the) circles is a connected set. See A250001, the main entry for this problem, for further information. %H A275924 Jon Wild, <a href="/A275923/a275923.png">Figure showing relationship between A250001, A275923, A275924, and A288554 for n=3 circles</a> %Y A275924 Cf. A250001, A275923, A288554-A288568. %K A275924 nonn,more %O A275924 0,4 %A A275924 _N. J. A. Sloane_, Aug 29 2016, based on information supplied by _Jon Wild_ %E A275924 a(5) corrected by _Jon Wild_, Aug 31 2016