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 A127400 #12 Jun 30 2021 12:40:52 %S A127400 6,8,17,10,20,22,27,23,34,33,51,44,52 %N A127400 Number of segments of the longest possible zigzag paths fitting into a circle of diameter 3 if the path with index n is constructed according to the rules of the "Snakes on a Plane" problem of Al Zimmermann's programming contest. %C A127400 The problems corresponding to n=3,4,6 had been excluded from the contest. %C A127400 a(16) >= 52. - _Hugo Pfoertner_, Jun 30 2021 %H A127400 Contest Organizers, <a href="http://www.enginemonitoring.net/azpc/zz/descript.htm">Snakes on a plane.</a>. Rules for the Fall 2006 round of Al Zimmermann's Programming Contests. %H A127400 Contest Organizers, <a href="http://www.recmath.org/contest/Snakes/index.php">Al Zimmermann's Programming Contests - Snakes on a Plane</a> %H A127400 Hugo Pfoertner, <a href="http://www.enginemonitoring.net/azpc/zz/azpczzresults.htm">Submitted Zigzag Paths Sorted by Problem Class.</a> Contest results. %H A127400 Hugo Pfoertner, <a href="http://www.antiton.de/snake/index.html?s=13+fFfFfFfFDACACADFfFfFfFfafFfFfFfFfdFdfFfFfFfafFfFfF">Longest snake for n=13</a> %H A127400 Hugo Pfoertner, <a href="http://www.antiton.de/snake/index.html?s=14+FfFfF0fFfbabcfFfFfF0fFCABFfF0e0fFfFfFfcdFfF">Longest snake for n=14</a> %H A127400 Hugo Pfoertner, <a href="http://www.antiton.de/snake/index.html?s=15+GagGgGgGgAGAGgGgGgGgdbcacbddgEFfGaGgGgGagagGgGgGgAG">Longest snake for n=15</a>, first possible configuration. %H A127400 Hugo Pfoertner, <a href="http://www.antiton.de/snake/index.html?s=15+GgGgGagbGgcacbgAGgGgGgGAGAgGgGgagaGgGDgGfcdAgGgGgGg">Longest snake for n=15</a>, second possible configuration. %H A127400 Hugo Pfoertner, <a href="http://www.antiton.de/snake/index.html?s=16+gGgGgGgGgGgGCEgGgGgdbGBBBACADGgGgGgGgGgacgCGgGgGgGg">Longest known snake for n=16</a>, conjectured unique solution. %Y A127400 Cf. A127399 [solutions for container diameter 2], A127401 [solutions for container diameter 4], A122223, A122224, A122226 [solutions for hinge angles excluded from contest]. %K A127400 hard,more,nonn %O A127400 3,1 %A A127400 _Hugo Pfoertner_, Jan 12 2007 %E A127400 a(13)-a(15) and update of links from _Hugo Pfoertner_, Jul 02 2011