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 A089956 #20 Aug 16 2017 04:24:36 %S A089956 0,0,0,12,461,27004,798271,32668081,959129557,35695709940, %T A089956 1078854669486,39147687661803,1224448528652016,44252532348552226 %N A089956 Number of chess games that end in check (but not checkmate) after exactly n plies. %H A089956 F. Labelle, <a href="http://www.cs.berkeley.edu/~flab/chess/statistics-games.html">Statistics on chess games</a> %H A089956 <a href="/index/Ch#chess">Index entries for sequences related to number of chess games</a> %Y A089956 Cf. A079485, A048987. %K A089956 nonn,hard,fini %O A089956 0,4 %A A089956 _François Labelle_, Jan 12 2004 %E A089956 a(11) from _François Labelle_, Jul 25 2004, who thanks Joost de Heer for providing computer time. %E A089956 a(12) from _François Labelle_, Mar 04 2012 %E A089956 a(13) from _François Labelle_, Aug 15 2017