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 A059731 #3 Mar 30 2012 16:49:03 %S A059731 1,2,4,8,20,94,2108,695476,120914640072,102916053328656342226, %T A059731 2647928508186688136206570909837012470132, %U A059731 1011512706265078711983169811701795624935502997612381468564241675434874528 %N A059731 Row sums in A059922. %K A059731 nonn %O A059731 0,2 %A A059731 _N. J. A. Sloane_, Feb 09 2001