A333113 The number of vertices inside a heptagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.

42, 708, 5369, 17417, 47796, 99261, 194278, 331955, 546805, 833946, 1245314, 1762265, 2461837, 3311680, 4402405, 5700598, 7322231, 9200878, 11494161, 14108123, 17224438, 20752264, 24894009, 29506128, 34854099, 40780391, 47552050

Offset

1,1

Comments

See the links in A329713 for images of the heptagons.

Links

Table of n, a(n) for n=1..27.

Crossrefs

Cf. A329713 (regions), A329714 (n-gons), A333112 (edges), A330846, A092866, A332599, A007569.

Sequence in context: A214945 A159947 A330845 * A252827 A231158 A030197

Adjacent sequences: A333110 A333111 A333112 * A333114 A333115 A333116

Keyword

nonn,more

Author

Scott R. Shannon and N. J. A. Sloane, Mar 07 2020

Extensions

a(8)-a(27) from Lars Blomberg, May 13 2020

Status

approved