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 A220835 #22 Feb 18 2023 10:37:03 %S A220835 4,42,180,1250,9756,81770,721508,6599982,62041488,595614158 %N A220835 Erroneous version of A339784. %C A220835 See A220833 for a description of the error. %H A220835 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 A220835 dead %O A220835 1,1