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 A024388 #13 Jul 06 2019 20:59:42
%S A024388 3,7,12,18,26,35,46,58,71,86,101,119,137,157,178,201,225,250,276,304,
%T A024388 334,364,396,429,464,500,537,575,615,657,699,743,788,835,883,932,982,
%U A024388 1034,1088,1142,1198,1255,1314,1374,1435,1497,1561,1627,1693,1761,1830
%N A024388 [ (3rd elementary symmetric function of S(n))/(2nd elementary symmetric function of S(n)) ], where S(n) = {first n+2 positive integers congruent to 1 mod 4}.
%F A024388 Empirical g.f.: x*(x^20 -2*x^19 +x^18 +x^12 -2*x^11 +x^10 +x^9 -x^8 -x^7 -2*x^6 -x^5 -2*x^4 -x^3 -x^2 -x -3) / ((x -1)^3*(x^2 +x +1)*(x^6 +x^3 +1)). - _Colin Barker_, Aug 16 2014
%F A024388 a(n) = floor(A024379(n + 1) / A024378(n + 2)). - _Sean A. Irvine_, Jul 06 2019
%K A024388 nonn,easy
%O A024388 1,1
%A A024388 _Clark Kimberling_
%E A024388 More terms from _Joshua Zucker_, May 20 2006