

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
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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 (ngons), 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



