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 A359118 #11 May 06 2025 11:26:17 %S A359118 1,2,12,48,457,1027,6190,14652,40852,71601,223637,325661,847984, %T A359118 1269433,2053303,3157887,6638971,8490949,16421392,21323264,30639928 %N A359118 Number of edges in the planar Farey Ring graph FR(n) defined in A359116, including the regions between the convex hull and the bounding circle. %C A359118 See A359116 and A359117 for images of the figure. %F A359118 a(n) = A359116 + A359117 - 1 by Euler's formula. %Y A359118 Cf. A359116 (vertices), A359117 (regions), A359119 (k-gons), A358888, A006842, A006843, A005728, A135565. %K A359118 nonn,more %O A359118 1,2 %A A359118 _Scott R. Shannon_ and _N. J. A. Sloane_, Dec 17 2022