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 A114560 #2 Mar 30 2012 17:24:45 %S A114560 1,2,16, %T A114560 115792089237316195423570985008687907853269984665640564039457584007913129639936 %N A114560 Define two sequences by q(0)=0, p(n)=2^q(n), q(n+1)=p(n)^2; sequence gives p(n). %Y A114560 Square roots of A114561. %K A114560 nonn %O A114560 0,2 %A A114560 _Jeremy Gardiner_, Feb 15 2006