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 A163891 #3 Mar 31 2012 13:21:18 %S A163891 0,2,4,5,24,33,68,76,96,390,536,561,1092,1093,1156,1220,1554,6242, %T A163891 8465,8584,8977,17953,18500,19564,99396,99873,101444,137286,143633, %U A163891 279620,279622,287108,287248,397585,401796,1597720,1597969,1598532 %N A163891 Positions where A163890 obtains distinct new values. %H A163891 A. Karttunen, <a href="/A163891/b163891.txt">Table of n, a(n) for n = 0..42</a> %Y A163891 See A163892, A163893, A163896, A163911, A163912. %K A163891 nonn %O A163891 0,2 %A A163891 _Antti Karttunen_, Sep 19 2009