A333118 The number of edges inside a pentagram formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.

65, 1965, 14100, 49760, 130235, 268900, 522770, 911425, 1474680, 2276820, 3354695, 4785575, 6665240, 8973795, 11903415, 15446945, 19825715, 24850460, 31025390, 38221130, 46557865, 56092005, 67123385, 79765335, 94249750, 110346520, 128289075, 148525930, 171374335, 196206590

Offset

1,1

Comments

See the links in A331906 for images of the pentagrams.

Links

Table of n, a(n) for n=1..30.

Crossrefs

Cf. A331906 (regions), A331907 (n-gons), A333117 (vertices), A274586, A332600, A331765.

Sequence in context: A197088 A031604 A002502 * A095027 A017781 A017728

Adjacent sequences: A333115 A333116 A333117 * A333119 A333120 A333121

Keyword

nonn

Author

Scott R. Shannon and N. J. A. Sloane, Mar 08 2020

Extensions

a(7)-a(30) from Lars Blomberg, May 06 2020

Status

approved