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 A025511 #5 Mar 30 2012 18:35:25 %S A025511 2,4,5,7,6,5,4,3,2,28,27,26,25,24,23,61,60,344,343,342,341,340,339, %T A025511 338,337,336,335,334,333,332,331,330,329,328,327,326,325,871,870,869, %U A025511 868,867,866,865,864,863,862,861,860,859,858,857,856,855,854,853,852,851,850,849 %N A025511 Least k>1 such that reverse complement of first n terms of A006928 repeats beginning at k-th term. %K A025511 nonn %O A025511 1,1 %A A025511 _David W. Wilson_