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%I #17 Dec 20 2020 13:20:12
%S 1,1,1,2,4,9,19,44,99,226,506,1133,2506,5530,12104,26408,57296,123892,
%T 266712,572308,1223488,2607429,5538518,11729577,24766121,52143714,
%U 109475193,229218555,478646764,996885485,2070875492,4291068343
%N Number of 4-ary rooted trees with n nodes and height at most 6.
%H Sean A. Irvine, <a href="/A036611/b036611.txt">Table of n, a(n) for n = 0..1364</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_.