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 A089558 #6 Jan 25 2020 12:47:28 %S A089558 2,21,35,68,161,14,155,294,306,423,483,497,902,231,984,869,776,315, %T A089558 1209,1898,1143,1547,2670,1610,1020,3390,2585,3927,2505,2189,4380, %U A089558 5253,3332,84,5474,3791,2892,6695,2093,7449,6764,8607,2945,8246,9590,3731,5453 %N A089558 a(n)=A089551(n)/2. %H A089558 Ray Chandler, <a href="/A089558/b089558.txt">Table of n, a(n) for n = 1..10000</a> %Y A089558 Cf. A088319, A088515, A088516, A088546, A089545-A089552, A089554-A089557. %K A089558 nonn %O A089558 1,1 %A A089558 _Ray Chandler_, Nov 16 2003