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 A089557 #7 Mar 02 2023 14:27:58 %S A089557 2,3,5,4,7,14,5,6,18,9,21,7,22,33,24,11,8,45,39,26,9,13,30,10,60,30, %T A089557 55,33,15,11,60,51,68,84,34,17,12,65,91,39,76,57,95,38,70,13,19,42,84, %U A089557 105,105,14,42,21,112,80,115,144,92,15,138,69,48,46,119,85,153,16,23,51,150 %N A089557 a(n) = A089546(n)/2. %H A089557 Ray Chandler, <a href="/A089557/b089557.txt">Table of n, a(n) for n = 1..10000</a> %Y A089557 Cf. A088319, A088515, A088516, A088546, A089545-A089552, A089554-A089558. %K A089557 nonn %O A089557 1,1 %A A089557 _Ray Chandler_, Nov 16 2003