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.

1, 2, 12, 48, 457, 1027, 6190, 14652, 40852, 71601, 223637, 325661, 847984, 1269433, 2053303, 3157887, 6638971, 8490949, 16421392, 21323264, 30639928

Offset: 1

Author

Scott R. Shannon and N. J. A. Sloane, Dec 17 2022

Keywords

• nonn
• more

Comments

See A359116 and A359117 for images of the figure.

Crossrefs

Cf. A359116 (vertices), A359117 (regions), A359119 (k-gons), A358888, A006842, A006843, A005728, A135565.

Formula

a(n) = A359116 + A359117 - 1 by Euler's formula.