A333117 - OEIS

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A333117

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

4

26, 866, 6771, 24221, 64306, 132701, 259761, 453016, 734131, 1134081, 1673056, 2384606, 3326391, 4478286, 5941196, 7710796, 9901136, 12407581, 15497721, 19088991, 23256266, 28021386, 33537586, 39846196, 47092241, 55136771, 64103776, 74213991, 85642556, 98039461

(list; graph; refs; listen; history; text; internal format)

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), A333118 (edges), A092866, A332599, A007569.

Sequence in context: A139670 A231282 A357140 * A263945 A335609 A241871

Adjacent sequences: A333114 A333115 A333116 * A333118 A333119 A333120

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