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 A335757 #10 Jun 22 2020 13:20:28 %S A335757 1,14,78,112,50,252,484,532,848,448,1261,1316,1751,1862,1590,2436, %T A335757 3053,3136,3872,2912,4607,4844,5629,5824,5335,6734,7813,7966,9073, %U A335757 7056,10186,10500,11712,11984,11299,13258,14701,14980,16486,14406,17998,18312,19972 %N A335757 a(n) is the number of regions formed by n-secting the angles of a heptagon. %H A335757 Lars Blomberg, <a href="/A335757/b335757.txt">Table of n, a(n) for n = 1..200</a> %H A335757 Lars Blomberg, <a href="/A335757/a335757.png">Illustration for n=3</a> %H A335757 Lars Blomberg, <a href="/A335757/a335757_1.png">Illustration for n=4</a> %H A335757 Lars Blomberg, <a href="/A335757/a335757_2.png">Illustration for n=21</a> %H A335757 Lars Blomberg, <a href="/A335757/a335757_3.png">Illustration for n=22</a> %Y A335757 Cf. A329713 (n-sected sides, not angles), A335758 (vertices), A335759 (edges), A335760 (ngons). %K A335757 nonn %O A335757 1,2 %A A335757 _Lars Blomberg_, Jun 22 2020