|
%I #6 Jun 03 2016 06:47:32
%S 1,1,24,3892643213082624
%N Number of quaternary heaps on n levels (i.e., of (4^n-1)/3 elements).
%H Alois P. Heinz, <a href="/A273725/b273725.txt">Table of n, a(n) for n = 0..5</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/D-ary_heap">D-ary heap</a>
%F a(n) = A178009(A002450(n)).
%Y Column k=4 of A273712.
%Y Cf. A002450, A178009.
%K nonn
%O 0,3
%A _Alois P. Heinz_, May 28 2016
| 