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 A073660 #8 Aug 28 2017 12:38:38 %S A073660 1,2,4,6,12,22,26,42,58,64,96,110,128,156,216,234,242,268,298,310,330, %T A073660 356,380,384,408,422,424,454,462,468,490,516,580,634,648,664,708,806, %U A073660 824,826,864,894,896,986,1038,1114,1122,1160,1244,1246,1254,1264,1316,1420 %N A073660 Terms of A073659 which retain their relative positions. %H A073660 Chai Wah Wu, <a href="/A073660/b073660.txt">Table of n, a(n) for n = 1..10000</a> %Y A073660 Cf. A073659. %K A073660 nonn %O A073660 1,2 %A A073660 _Amarnath Murthy_, Aug 10 2002 %E A073660 More terms from _Sascha Kurz_, Jan 28 2003