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 A274684 #24 Aug 24 2016 15:23:22 %S A274684 2448,5012,9064,19964,26164,32064,32104,15000,2680,8 %N A274684 White to move: King and Queen vs. King: Number of positions with mate in n. %C A274684 After n = 10, all terms are 0 so the sequence ends at n = 10. %C A274684 GBR code is 1000. Longest checkmate under perfect play is in 10 (FEN 8/8/8/5k2/8/8/1Q6/K7 w - - 0 1). For path of moves, see k4it-link. Data is found using Kryukov link, "Endgame Tablebases online". FEN is found in Kryukov link, "Longest checkmates in chess". %C A274684 The listed examples, or more generally up to 6 man positions can be examined using the k4it link. %D A274684 Hans Zellner, International Computer Chess Association Journal, 1987, Vol. 10, No. 2, p. 95. %H A274684 Steven J. Edwards, <a href="https://groups.google.com/forum/#!topic/rec.games.chess/MOxyPAT7lBk">Endgame tablebase position count summaries</a>, 1994. %H A274684 EG 121, <a href="http://www.gadycosteff.com/eg/eg121.pdf">GBR class 1000.00</a>, 1996, p. 873. %H A274684 k4it, <a href="http://www.k4it.de/?topic=egtb&lang=en">All 6-men tables online (except 5 vs. 1).</a> %H A274684 K. Kryukov, <a href="http://kirill-kryukov.com/chess/tablebases-online/">Endgame Tablebases Online</a> %H A274684 K. Kryukov, <a href="http://kirill-kryukov.com/chess/longest-checkmates/longest-checkmates.shtml">Longest checkmates in chess</a> %H A274684 Wikipedia, <a href="https://en.wikipedia.org/wiki/GBR_code">GBR code</a> %Y A274684 Cf. A225551, A274458, A274683. %K A274684 nonn,fini,full %O A274684 1,1 %A A274684 _David A. Corneth_, Jul 02 2016 %E A274684 Data and comments changed by _Vaclav Kotesovec_, Aug 01 2016