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 A055289 #8 Dec 15 2023 20:24:52 %S A055289 1,-1,1,0,-3,5,9,-44,-50,545,572,-9890,-13263,251236,490208,-8309897, %T A055289 -25084529,340735734,1618199204,-16683530000,-123071639020, %U A055289 922641297931,10768715419165,-53177799474462,-1066100082041498 %N A055289 Column 1 of triangle A055288. %H A055289 <a href="/index/Ro#rooted">Index entries for sequences related to rooted trees</a> %Y A055289 Cf. A055288. %K A055289 sign %O A055289 1,5 %A A055289 _Christian G. Bower_, May 09 2000