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 A330911 #15 May 03 2020 06:05:10 %S A330911 5,15,35,76,142,251,408,576,947,1367,1845,2600,3460,4011,5822,7386, %T A330911 9023,11423,13967,16242,20330,24235,28222,33686,39327,44967,52733, %U A330911 60608,67383,78947,89530,100040,113885,127791,141925,159356,177158,194895,217232,239662 %N A330911 The number of edges formed by straight line segments mutually connecting all vertices of a semicircular polygon defined in A333642. %C A330911 See A333642 for a precise definition of the polygon and images. %H A330911 Lars Blomberg, <a href="/A330911/b330911.txt">Table of n, a(n) for n = 1..100</a> %Y A330911 Cf. A333642 (regions), A330913 (vertices), A330914 (n-gons), A333278, A333027, A135565. %K A330911 nonn %O A330911 1,1 %A A330911 _Scott R. Shannon_ and _N. J. A. Sloane_, May 02 2020 %E A330911 a(21) and beyond from _Lars Blomberg_, May 03 2020