%I #26 May 11 2020 09:38:22
%S 20,290,2215,7405,21150,43490,88230,151135,250825,384360,578840,
%T 814180,1151525,1550530,2063225,2676925,3452460,4333340,5436210,
%U 6668320,8154980,9837690,11822175,13993360,16569650,19401865,22636495,26182350,30253225,34608450,39628050
%N The number of edges inside a pentagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.
%C See the links in A331929 for images of the pentagons.
%H Lars Blomberg, <a href="/A329710/b329710.txt">Table of n, a(n) for n = 1..35</a>
%Y Cf. A331929 (regions), A331939 (n-gons), A330847 (vertices), A330845, A274586, A332600, A331765.
%K nonn
%O 1,1
%A _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 07 2020
%E a(9) and beyond from _Lars Blomberg_, May 11 2020