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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. 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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

LINKS

Table of n, a(n) for n=1..40.

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.

Sequence in context: A148433 A148434 A341762 * A062122 A148435 A047022

Adjacent sequences:  A341875 A341876 A341877 * A341879 A341880 A341881

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified May 18 19:58 EDT 2021. Contains 344002 sequences. (Running on oeis4.)