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 A052313 #9 Dec 19 2015 12:58:27 %S A052313 1,2,1,3,2,1,4,3,2,1,6,5,5,2,1,8,7,8,5,2,1,14,13,18,13,7,2,1,20,19,30, %T A052313 25,16,7,2,1,36,35,64,59,44,21,9,2,1,60,59,120,129,102,57,28,9,2,1, %U A052313 108,107,244,291,260,159,86,33,11,2,1,188,187,470,629,620,417,246,107 %N A052313 Triangle read by rows: matrix square of A047996. %H A052313 <a href="/index/Ne#necklaces">Index entries for sequences related to necklaces</a> %e A052313 1; 2,1; 3,2,1; 4,3,2,1; 6,5,5,2,1; ... %K A052313 nonn,tabl %O A052313 0,2 %A A052313 _Christian G. Bower_, Dec 15 1999