%I #14 Dec 20 2020 17:11:21
%S 1,1,1,2,4,9,19,45,106,260,642,1614,4074,10356,26341,67093,170735,
%T 434149,1102279,2794856,7075440,17887216,45157381,113859010,286737286,
%U 721310274,1812628225,4550676482,11414249153,28605296518,71629527442
%N Number of 4-ary rooted trees with n nodes and height at most 9.
%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
%O 0,4
%A _N. J. A. Sloane_.