login
A358950
Number of edges formed inside a triangle with edge length 1 by the straight line segments mutually connecting all vertices and points that divide the sides into segments with lengths equal to the Farey series of order n = A006842(n,k)/A006843(n,k), k = 1..A005728(n).
6
3, 21, 375, 2574, 22083, 52791, 279750, 673050, 1851816, 3272058, 9865560, 14592537
OFFSET
1,1
COMMENTS
The number of points along each edge is given by A005728(n).
See A358948 and A358949 for images of the square.
FORMULA
a(n) = A358948(n) + A358949(n) - 1 by Euler's formula.
CROSSREFS
Cf. A358948 (regions), A358949 (vertices), A358951 (k-gons), A358888, A006842, A006843, A005728, A358882.
Sequence in context: A101389 A353321 A108716 * A271570 A084620 A120603
KEYWORD
nonn,more
AUTHOR
STATUS
approved