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 A271857 #12 Jan 15 2017 12:01:35 %S A271857 1,2,12,173,5429,392544,66961869,27094069322,26124568587557, %T A271857 60352331499840380,335377713005955826349,4494480789037552980419332, %U A271857 145516206571394421594063628243,11398373584242623552596178870957640,2162546126021822830176241418936795142991 %N A271857 Number of ways to dissect a hexagon with side length n exactly into six identical parts in a triangular lattice. %C A271857 This sequence only enumerates those dissections in which the six pieces are arranged around the center at 60-degree intervals. Other dissections are possible, such as those formed from those trisections which can be further bisected into identical parts. %H A271857 G. P. Jelliss, <a href="http://www.mayhematics.com/j/gpj22.htm#(3)">Dissected Hexagons</a>, The Games and Puzzles Journal, Issue 22, January-April 2002. %Y A271857 Cf. A113900, A268606, A271741. %K A271857 nonn %O A271857 1,2 %A A271857 _Andrew Howroyd_, Apr 15 2016