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%I #9 Dec 17 2022 23:30:31
%S 1,2,12,48,457,1027,6190,14652,40852,71601,223637,325661,847984,
%T 1269433,2053303,3157887,6638971,8490949,16421392,21323264,30639928
%N Number of edges in the planar Farey Ring graph FR(n) defined in A359116, including the regions bewteen the convex hull and the bounding circle.
%C See A359116 and A359117 for images of the figure.
%F a(n) = A359116 + A359117 - 1 by Euler's formula.
%Y Cf. A359116 (vertices), A359117 (regions), A359119 (k-gons), A358888, A006842, A006843, A005728, A135565.
%K nonn,more
%O 1,2
%A _Scott R. Shannon_ and _N. J. A. Sloane_, Dec 17 2022
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