A067162 a(n) = A062361(n)/n.

1, 2, 3, 5, 7, 10, 12, 16, 23, 29, 34, 39, 53, 62, 78, 87, 110, 108, 136, 163, 184, 200, 242, 251, 297, 318, 389, 371, 449, 480, 547, 563, 679, 676, 759, 794, 900, 958, 1079, 1093, 1225, 1261, 1353, 1398, 1602, 1613, 1730, 1794, 1953, 2055, 2253, 2244, 2450

Offset: 4

Author

Sascha Kurz, Jan 06 2002

Keywords

• easy
• nonn

References

• B. Poonen and M. Rubinstein, Number of Intersection Points Made by the Diagonals of a Regular Polygon, SIAM J. Discrete Mathematics, Vol. 11, pp. 135-156.

Links

• Jean-François Alcover, Table of n, a(n) for n = 4..100
• Sascha Kurz, m-gons in regular n-gons
• B. Poonen and M. Rubinstein, The number of intersection points made by the diagonals of a regular polygon, SIAM J. on Discrete Mathematics, Vol. 11, No. 1, 135-156 (1998).
• Sequences formed by drawing all diagonals in regular polygon

Crossrefs

Cf. A062361.

Programs

Mathematica

A062361 = Import["https://oeis.org/A062361/b062361.txt", "Table"][[All, 2]];
a[n_] := A062361[[n - 2]]/n;
a /@ Range[4, 100] (* Jean-François Alcover, Sep 11 2019 *)