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 A220834 #22 Feb 18 2023 10:37:06 %S A220834 3,24,82,444,2688,17394,118470,835980,6062392,44897274 %N A220834 Erroneous version of A339783. %C A220834 See A220833 for a description of the error. %H A220834 V. P. Johnson, <a href="https://people.math.sc.edu/czabarka/Theses/JohnsonThesis.pdf">Enumeration Results on Leaf Labeled Trees</a>, Ph. D. Dissertation, Univ. Southern Calif., 2012. %K A220834 dead %O A220834 1,1