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 A051665 #4 May 11 2007 03:00:00 %S A051665 3,4,4,5,8,5,6,13,13,6,7,19,26,19,7,8,26,45,45,26,8,9,34,71,90,71,34,9 %N A051665 Duplicate of A028263. %K A051665 dead %O A051665 0,1