A036631 - OEIS

%I #16 Dec 24 2020 02:32:19

%S 0,0,0,0,0,0,0,1,6,26,94,302,900,2546,6931,18341,47474,120750,302741,

%T 750050,1839421,4471759,10787891,25849612,61564934,145828769,

%U 343713516,806462038,1884353462,4386038531,10172642984,23515472829,54190799650

%N Number of 4-ary rooted trees with n nodes and height exactly 7.

%H Sean A. Irvine, <a href="/A036631/b036631.txt">Table of n, a(n) for n = 0..5460</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 0,9

%A _N. J. A. Sloane_.