A341878 The number of vertices on a vesica piscis formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.

2, 5, 19, 65, 203, 429, 963, 1643, 2929, 4173, 7179, 9985, 14747, 19503, 27043, 34511, 46011, 57171, 73339, 87509, 111219, 132809, 162459, 190703, 229419, 266285, 315041, 361179, 423067, 480201, 556451, 627039, 718923, 805217, 915091, 1017379, 1148595, 1270569, 1423907, 1564359

Offset: 1

Author

Scott R. Shannon and N. J. A. Sloane, Feb 22 2021

Keywords

• nonn

Comments

The terms are from numeric computation - no formula for a(n) is currently known.

Links

• Scott R. Shannon, Vertices for n = 4.
• Scott R. Shannon, Vertices for n = 5.
• Scott R. Shannon, Vertices for n = 10.
• Scott R. Shannon, Vertices for n = 15.
• Scott R. Shannon, Vertices for n = 16.
• Wikipedia, Vesica piscis.

Crossrefs

Cf. A341877 (regions), A342152 (edges), A342153 (n-gons), A007569, A092866, A340644, A340686.