This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A329710 #26 May 11 2020 09:38:22 %S A329710 20,290,2215,7405,21150,43490,88230,151135,250825,384360,578840, %T A329710 814180,1151525,1550530,2063225,2676925,3452460,4333340,5436210, %U A329710 6668320,8154980,9837690,11822175,13993360,16569650,19401865,22636495,26182350,30253225,34608450,39628050 %N A329710 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 A329710 See the links in A331929 for images of the pentagons. %H A329710 Lars Blomberg, <a href="/A329710/b329710.txt">Table of n, a(n) for n = 1..35</a> %Y A329710 Cf. A331929 (regions), A331939 (n-gons), A330847 (vertices), A330845, A274586, A332600, A331765. %K A329710 nonn %O A329710 1,1 %A A329710 _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 07 2020 %E A329710 a(9) and beyond from _Lars Blomberg_, May 11 2020