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 A169981 #4 Mar 30 2012 17:30:00 %S A169981 1,3,7,21,93,217,381,651,2667,8191,11811,24573,57337,82677,172011, %T A169981 393213,761763,1572861,2752491,5332341,11010027,21845397,48758691, %U A169981 85327221,199753347,341310837,677207307,1398273429,3220807683 %N A169981 Positions of records in A175432. %H A169981 Ray Chandler, <a href="/A169981/b169981.txt">Table of n, a(n) for n=1..466</a> %K A169981 nonn %O A169981 1,2 %A A169981 _N. J. A. Sloane_, Aug 19 2010 %E A169981 Extended by _Ray Chandler_, Aug 20 2010