cp's OEIS Frontend

A333026 The number of vertices formed on an isosceles triangle by straight line segments mutually connecting all vertices and all points that divide the two equal length sides into n equal parts; the base of the triangle contains no points other than its vertices.

%I A333026 #8 May 26 2020 10:25:36
%S A333026 3,6,16,45,111,230,448,769,1229,1858,2860,4007,5737,7724,10115,13074,
%T A333026 17172,21454,27288,33332,40413,48944,59594,70213,82983,97608,113672,
%U A333026 131032,152986,174088,201090,228295,258467,292726,328080,365633,412291,460834,512016
%N A333026 The number of vertices formed on an isosceles triangle by straight line segments mutually connecting all vertices and all points that divide the two equal length sides into n equal parts; the base of the triangle contains no points other than its vertices.
%C A333026 See the links in A332953 for images of the triangles.
%H A333026 Lars Blomberg, <a href="/A333026/b333026.txt">Table of n, a(n) for n = 1..70</a>
%Y A333026 Cf. A332953 (regions), A333025 (n-gons), A333027 (edges), A007678, A092867, A331452, A331911, A332357, A332358.
%K A333026 nonn
%O A333026 1,1
%A A333026 _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 05 2020
%E A333026 a(16) and beyond from _Lars Blomberg_, May 26 2020