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 A140484 #3 Mar 30 2012 17:35:01 %S A140484 1,2,3,8,9,28,39,172,185,364,369,2236,2253,3936,3943,17320,17323, %T A140484 43002,43005 %N A140484 Square roots of terms of A140483. %Y A140484 Cf. A064491, A140483. %K A140484 nonn %O A140484 1,2 %A A140484 Franklin T. Adams-Watters, Jun 25 2008 %E A140484 a(16)-a(19) from _Donovan Johnson_, Oct 06 2009