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 A052309 #8 Dec 19 2015 12:58:59 %S A052309 1,-1,0,1,0,-1,-1,0,4,8,2,-34,-108,-160,189,2363,8032,12277,-30155, %T A052309 -347952,-1464609,-3099733,4975748,96347901,539113345,1751884290, %U A052309 714138346,-40349734815,-334283308597,-1643012627964,-4159491453450 %N A052309 Column 1 of triangle A052308. %H A052309 <a href="/index/Br#bracelets">Index entries for sequences related to bracelets</a> %K A052309 sign %O A052309 1,9 %A A052309 _Christian G. Bower_, Dec 15 1999