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 A057387 #7 Mar 30 2012 16:48:52 %S A057387 3,0,0,0,36,72,-72,0,711,1080,144,-2556,12852,23004,-504,-21192, %T A057387 122877,525996,69366,-531576,1970154,7833756,6613164,-12953124, %U A057387 24243261,137623572,130318974,-138059232,115953372,2338653528 %N A057387 Low-temperature susceptibility expansion for hexagonal lattice (Potts model, q=4). %C A057387 The hexagonal lattice is the familiar 2-dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice. %H A057387 I. Jensen, <a href="/A057387/b057387.txt">Table of n, a(n) for n = 0..53</a> (from link below) %H A057387 I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/potts/series/trp4sus.ser">More terms</a> %H A057387 G. Nebe and N. J. A. Sloane, <a href="http://www.math.rwth-aachen.de/~Gabriele.Nebe/LATTICES/A2.html">Home page for hexagonal (or triangular) lattice A2</a> %Y A057387 Cf. A057374-A057405. %K A057387 sign %O A057387 0,1 %A A057387 _N. J. A. Sloane_, Aug 30 2000