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 A055299 #11 Mar 07 2022 10:22:57 %S A055299 1,6,36,199,984,4433,18257,69390,245105,810418,2522646,7432876, %T A055299 20825678,55717629,142862730,352212459,837368658,1924861589, %U A055299 4288250970,9278750495,19537503288,40103712085,80377128541 %N A055299 Number of trees with n nodes and 12 leaves. %H A055299 Georg Fischer, <a href="/A055299/b055299.txt">Table of n, a(n) for n = 13..250</a> %H A055299 <a href="/index/Tra#trees">Index entries for sequences related to trees</a> %Y A055299 Column 12 of A055290. %K A055299 nonn %O A055299 13,2 %A A055299 _Christian G. Bower_, May 09 2000