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 A057381 #5 Mar 30 2012 16:48:52 %S A057381 1,0,0,0,3,0,6,12,3,72,66,144,822,480,3624,8508,10482,65856,94794, %T A057381 289452,1008420,1561032,6503532,15224016,34976979,125988144,263308986, %U A057381 805096764,2319752694,5402283396,17415097542,44310604860 %N A057381 Low-temperature partition function expansion for square lattice (Potts model, q=4). %H A057381 I. Jensen, <a href="/A057381/b057381.txt">Table of n, a(n) for n = 0..59</a> (from link below) %H A057381 I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/potts/series/sqp4pf.ser">More terms</a> %Y A057381 Cf. A057374-A057405. %K A057381 nonn %O A057381 0,5 %A A057381 _N. J. A. Sloane_, Aug 30 2000