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 A169710 #4 Jan 21 2016 17:44:24 %S A169710 4,4,12,8,12,20,28,12,12,20,28,28,44,76,68,20,12,20,28,28,44,76,68,36, %T A169710 44,68,84,100,164,244,156,36,12,20,28,28,44,76,68,36,44,68,84,100,164, %U A169710 244,156,52,44,68,84,100,164,220,172,116,156,220,268,364,572,700,348,68,12 %N A169710 First differences of A169709. %H A169710 David Applegate, <a href="/A139250/a139250.anim.html">The movie version</a> %K A169710 nonn %O A169710 0,1 %A A169710 _N. J. A. Sloane_, Apr 17 2010