A036633 - OEIS

%I #13 Dec 24 2020 02:32:11

%S 0,0,0,0,0,0,0,0,0,1,8,43,188,720,2522,8288,25973,78506,230716,663100,

%T 1871936,5207632,14312497,38937270,105015752,281132871,747756946,

%U 1977633148,5204143935,13633435312,35572076796,92475463113,239606189255

%N Number of 4-ary rooted trees with n nodes and height exactly 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 0,11

%A _N. J. A. Sloane_.