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 A195569 #9 Jun 05 2015 03:19:50 %S A195569 4,15,209,1116,3807,53985,287844,982255,13927857,74262716,253417919, %T A195569 3593333185,19159492804,65380840911,927066033809,4943074880796, %U A195569 16868003537055,239179443389601,1275294159752484,4351879531719343,61707369328483185 %N A195569 Numerators b(n) of Pythagorean approximations b(n)/a(n) to 7/4. %C A195569 See A195500 for discussion and list of related sequences; see A195568 for Mathematica program. %F A195569 Empirical g.f.: -x*(x^8-x^7-4*x^6-272*x^5+48*x^4-88*x^3-209*x^2-15*x-4) / (x^9-257*x^6-257*x^3+1). - _Colin Barker_, Jun 04 2015 %Y A195569 Cf. A195500, A195568, A195570. %K A195569 nonn %O A195569 1,1 %A A195569 _Clark Kimberling_, Sep 21 2011