%I #16 Dec 20 2020 03:35:47
%S 1,1,1,2,4,9,18,39,80,165,331,664,1307,2569,4983,9624,18416,35060,
%T 66218,124411,232138,430783,794431,1457063,2656709,4817940,8688296,
%U 15584381,27802598,49340196,87100640,152968396,267264610,464600889
%N Number of 4-ary rooted trees with n nodes and height at most 5.
%H Sean A. Irvine, <a href="/A036610/b036610.txt">Table of n, a(n) for n = 0..340</a>
%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_.