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 A333109 #9 May 14 2020 15:51:05 %S A333109 57,1145,8417,29121,80345,167105,333297,570969,939113,1441153,2153937, %T A333109 3029913,4262929,5741473,7606745,9876585,12690553,15921777,19922289, %U A333109 24430633,29834073,35990065,43151521,51068689 %N A333109 The number of vertices on an octagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts. %C A333109 See the links in A333075 for images of the octagons. %Y A333109 Cf. A333075 (regions), A333076 (n-gons), A333110 (edges), A330846, A092866, A332599, A007569. %K A333109 nonn,more %O A333109 1,1 %A A333109 _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 07 2020 %E A333109 a(7)-a(24) from _Lars Blomberg_, May 14 2020