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%I #17 Dec 21 2020 03:17:53
%S 1,1,1,2,4,8,15,29,52,95,168,297,513,887,1504,2543,4247,7054,11596,
%T 18964,30732,49529,79210,125944,198861,312224,487021,755435,1164641,
%U 1785574,2721591,4125745,6219019,9324141,13902921,20620505,30419742
%N Number of 6-ary rooted trees with n nodes and height at most 4.
%H Sean A. Irvine, <a href="/A036621/b036621.txt">Table of n, a(n) for n = 0..258</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_.