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 A056621 #10 Apr 25 2022 08:02:52 %S A056621 8,66,600,5164,42872,346828,2754056,21549780,166626744,1275865332, %T A056621 9690096824,73090383120,548064459968,4088719617824,30367415294800, %U A056621 224659143155964,1656259765448200,12172580326973688 %N A056621 a(n) is the total radius of gyration of all self-avoiding polygons of length 2n on the square lattice. %H A056621 I. Jensen, <a href="/A056621/b056621.txt">Table of n, a(n) for n = 2..50</a> (from link below) %H A056621 Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a056/A056621.java">Java program</a> (github) %H A056621 I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/polygons/series/square.perim.rgs.ser">More terms</a> %Y A056621 Cf. A002931. %K A056621 nonn %O A056621 2,1 %A A056621 _N. J. A. Sloane_, Aug 30 2000 %E A056621 Title clarified by _Sean A. Irvine_, Apr 25 2022