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 A195548 #19 Jun 26 2022 02:47:12 %S A195548 0,3,5,8,39,105,136,715,1869,2448,12815,33553,43920,229971,602069, %T A195548 788120,4126647,10803705,14142232,74049691,193864605,253772064, %U A195548 1328767775,3478759201,4553754912,23843770275,62423800997,81713816360,427859097159,1120149658761 %N A195548 Numerators b(n) of Pythagorean approximations b(n)/a(n) to 1/2. %C A195548 See A195500 for discussion and list of related sequences; see A195547 for Mathematica program. %F A195548 a(n) = (F(n+1)^2-F(n)^2)/(2-((n+2)^2 mod 3)), where F(n)=Fibonacci(n). [_Gary Detlefs_, Oct 15 2011] %F A195548 Empirical G.f.: x*(3+5*x+8*x^2-12*x^3+20*x^4+x^6-x^7)/(1-17*x^3-17*x^6+x^9). [_Colin Barker_, Apr 15 2012] %Y A195548 Cf. A195500, A195547, A195549, A131534. %K A195548 nonn %O A195548 1,2 %A A195548 _Clark Kimberling_, Sep 20 2011