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 A089556 #5 Jan 25 2020 12:40:55 %S A089556 3,7,9,13,19,15,21,31,27,33,33,43,43,37,45,51,57,49,55,63,73,73,75,91, %T A089556 69,87,79,93,99,111,97,103,93,85,115,129,133,117,103,135,121,133,111, %U A089556 147,139,157,163,159,153,141,145,183,183,201,169,189,175,153,189,211 %N A089556 a(n)=(A089545(n)+1)/2. %H A089556 Ray Chandler, <a href="/A089556/b089556.txt">Table of n, a(n) for n = 1..10000</a> %Y A089556 Cf. A088319, A088515, A088516, A088546, A089545-A089552, A089554-A089558. %K A089556 nonn %O A089556 1,1 %A A089556 _Ray Chandler_, Nov 16 2003