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 A195575 #7 Mar 30 2012 18:57:48 %S A195575 0,5,260,2289,4991,7020,94635,5103280,44852079,97850481,137599280, %T A195575 1855038645,100034487540,879190467169,1918065106671,2697221086300, %U A195575 36362467421275,1960876019662560,17233891492577759,37597912123131361 %N A195575 Numerators b(n) of Pythagorean approximations b(n)/a(n) to 2/5. %C A195575 See A195500 for discussion and list of related sequences; see A195574 for Mathematica program. %Y A195575 Cf. A195500, A195574, A195576. %K A195575 nonn,frac %O A195575 1,2 %A A195575 _Clark Kimberling_, Sep 21 2011