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 A024201 #10 Sep 23 2016 08:11:28
%S A024201 0,2,5,9,14,19,26,34,43,53,64,75,88,102,117,133,150,167,186,206,227,
%T A024201 249,272,295,320,346,373,401,430,459,490,522,555,589,624,659,696,734,
%U A024201 773,813,854,895,938,982
%N A024201 [ (2nd elementary symmetric function of S(n))/(first elementary symmetric function of S(n)) ], where S(n) = {first n+1 odd positive integers}.
%F A024201 Empirical g.f.: x^2*(x^6-2*x^5-x^3-x^2-x-2) / ((x-1)^3*(x+1)*(x^2-x+1)*(x^2+x+1)). - _Colin Barker_, Aug 15 2014
%F A024201 a(n) = floor( A024196(n)/(1+n)^2). - _R. J. Mathar_, Sep 23 2016
%K A024201 nonn
%O A024201 1,2
%A A024201 _Clark Kimberling_