cp's OEIS Frontend

A333027 The number of edges 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 A333027 #7 May 26 2020 10:25:48
%S A333027 3,10,33,96,235,486,933,1600,2561,3884,5907,8310,11793,15890,20863,
%T A333027 27002,35229,44117,55820,68312,82931,100368,121711,143685,169750,
%U A333027 199509,232366,268169,312132,355839,409902,465503,527080,596443,668961,746443,839830,937967
%N A333027 The number of edges 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 A333027 See the links in A332953 for images of the triangles.
%H A333027 Lars Blomberg, <a href="/A333027/b333027.txt">Table of n, a(n) for n = 1..70</a>
%Y A333027 Cf. A332953 (regions), A333025 (n-gons), A333026 (vertices), A007678, A092867, A331452, A331911, A332357, A332358.
%K A333027 nonn
%O A333027 1,1
%A A333027 _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 05 2020
%E A333027 a(16) and beyond from _Lars Blomberg_, May 26 2020