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 A217934 #15 Apr 07 2015 11:11:16 %S A217934 0,1,6,11,96,132,171,220,267,269,282,287,298,365,401,468,476,486,502, %T A217934 613,644,649,706,729,892,897,988,1122,1161,1177,1187,1445,1471,1575, %U A217934 1614,1639 %N A217934 Records in A102419. %C A217934 If the "1" is omitted, also records in A060445. %H A217934 Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/3x+1.html">Tables</a> %H A217934 Eric Roosendaal, <a href="http://www.ericr.nl/wondrous/index.html">On the 3x + 1 problem</a> %H A217934 N. J. A. Sloane, <a href="/A102419/a102419.txt">First 36 terms of A217934 and A060412</a> [From Roosendaal web site] %e A217934 See A102419. %Y A217934 Cf. A102419, A060445, A060412. %K A217934 nonn,more %O A217934 1,3 %A A217934 _N. J. A. Sloane_, Oct 20 2012