A036587 - OEIS

%I #13 Dec 19 2020 03:12:07

%S 1,1,1,2,3,5,6,8,8,9,7,7,4,3,1,1

%N Number of binary rooted trees with n nodes and height at most 4.

%H 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 <a href="/index/Ro#rooted">Index entries for sequences related to rooted trees</a>

%K nonn,fini,full

%O 0,4

%A _N. J. A. Sloane_.