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 A124481 #4 Jul 12 2020 10:49:01 %S A124481 1,1,2,5,11,31,75,232,607 %N A124481 Number of connected hook length posets, with n elements. %H A124481 Cheryl A. Gann and Robert A. Proctor, <a href="http://lists-of-posets.math.unc.edu/defcnt.html#pstcnts">Poset Counts</a> %H A124481 Robert A. Proctor, <a href="http://www.math.unc.edu/Faculty/rap/Hook.html">Definition of hook length poset</a> %Y A124481 Cf. A000112, A124480, A124482, A124483. %K A124481 more,nonn %O A124481 1,3 %A A124481 _Franklin T. Adams-Watters_, Nov 03 2006