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 A114389 #2 Mar 31 2012 13:21:10 %S A114389 1,7,13,11,25,31,21,19,49,55,61,59,41,47,37,35,97,103,109,107,121,127, %T A114389 117,115,81,87,93,91,73,79,69,67,193,199,205,203,217,223,213,211,241, %U A114389 247,253,251,233,239,229,227,161,167,173,171,185,191,181,179,145,151 %N A114389 Bisection of A065621. %K A114389 nonn %O A114389 1,2 %A A114389 _Antti Karttunen_, Feb 07 2006