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 A144687 #2 Mar 30 2012 16:51:01 %S A144687 4,8,16,36,81,180,400,900,2025,4500,10000,22200,49284,108336,238144, %T A144687 521672,1142761,2484356 %N A144687 Size of acyclic domain of size n based on the replacement scheme. %D A144687 B. Monjardet, Acyclic domains of linear orders: a survey, in "The Mathematics of Preference, Choice and Order: Essays in Honor of Peter Fishburn", edited by Steven Brams, William V. Gehrlein and Fred S. Roberts, Springer, 2009, pp. 139-160. %K A144687 nonn,more %O A144687 3,1 %A A144687 _N. J. A. Sloane_ Feb 07 2009