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 A036587 #15 Jul 08 2025 21:46:27 %S A036587 1,1,1,2,3,5,6,8,8,9,7,7,4,3,1,1 %N A036587 Number of binary rooted trees with n nodes and height at most 4. %H A036587 E. M. Rains and N. J. A. Sloane, <a href="https://cs.uwaterloo.ca/journals/JIS/cayley.html">On Cayley's Enumeration of Alkanes (or 4-Valent Trees)</a>, J. Integer Sequences, Vol. 2 (1999), Article 99.1.1. %H A036587 <a href="/index/Ro#rooted">Index entries for sequences related to rooted trees</a> %K A036587 nonn,fini,full %O A036587 0,4 %A A036587 _N. J. A. Sloane_