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 A330847 #25 May 11 2020 09:44:27 %S A330847 10,121,1055,3506,10410,21111,43740,74526,124490,190291,288190,403321, %T A330847 573805,771191,1027550,1331896,1721765,2157301,2712175,3322441, %U A330847 4067325,4904491,5900185,6975151,8268755,9678566,11297345,13060231,15102955,17263311,19784995 %N A330847 The number of vertices 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 A330847 See the links in A331929 for images of the pentagons. %H A330847 Lars Blomberg, <a href="/A330847/b330847.txt">Table of n, a(n) for n = 1..35</a> %Y A330847 Cf. A331929 (regions), A331939 (n-gons), A329710 (edges), A330846, A092866, A332599, A007569 %K A330847 nonn %O A330847 1,1 %A A330847 _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 07 2020 %E A330847 a(9) and beyond from _Lars Blomberg_, May 11 2020