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 A124480 #4 Jul 12 2020 10:48:17 %S A124480 1,2,4,10,23,63,165 %N A124480 Number of hook length posets with n elements. %H A124480 Cheryl A. Gann and Robert A. Proctor, <a href="http://lists-of-posets.math.unc.edu/defcnt.html#pstcnts">Poset Counts</a> %H A124480 Robert A. Proctor, <a href="http://www.math.unc.edu/Faculty/rap/Hook.html">Definition of hook length poset</a> %Y A124480 Cf. A000112, A124481, A124482, A124483, A124016. %K A124480 more,nonn %O A124480 1,2 %A A124480 _Franklin T. Adams-Watters_, Nov 03 2006