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 A056633 #13 Apr 26 2022 20:55:08 %S A056633 16,72,384,1864,8720,40064,180992,805416,3542720,15437280,66739168, %T A056633 286614344,1223894208,5200593136,22003683264,92745730384,389613088944, %U A056633 1631810452416,6816075114112,28401442383848 %N A056633 a(n) is the total squared perimeter of all self-avoiding polygons of area n on the square lattice. %H A056633 I. Jensen, <a href="/A056633/b056633.txt">Table of n, a(n) for n = 1..40</a> (from link below) %H A056633 I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/polygons/series/square.peri_mom2.ser">More terms</a> %Y A056633 Cf. A002931, A056632. %K A056633 nonn %O A056633 1,1 %A A056633 _N. J. A. Sloane_, Aug 30 2000 %E A056633 Title clarified by _Sean A. Irvine_, Apr 26 2022