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 A296409 #7 Dec 11 2017 17:33:57 %S A296409 1,1,1,1,3,30,4477 %N A296409 Number of digon-free cylindrical connected arrangements of n pseudo-circles on a sphere, in the sense that the union of the pseudo-circles is a connected set and two cells of the arrangement are separated by each of the pseudo-circles, reduced for mirror symmetry. %C A296409 For more information, see A288568. %Y A296409 Cf. A250001, A275923, A275924, A288554-A288568, A296406, A296407-A296412, A006248. %K A296409 nonn,more %O A296409 0,5 %A A296409 _Manfred Scheucher_, Dec 11 2017