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 A080016 #3 Mar 30 2012 18:36:33 %S A080016 1,2,3,5,23,51,227,1640,1867,9108,20083,69357,297511,3044467,3341978, %T A080016 9728423,13070401,22798824,35869225,560837199,596706424,2350956471, %U A080016 14702445250 %N A080016 Numerators of the convergents to the continued fraction of Pi^2/6. %Y A080016 Cf. A079937, A080017 (denominators). %K A080016 frac,nonn %O A080016 0,2 %A A080016 _Paul D. Hanna_, Jan 19 2003