A273729 - OEIS

%I #7 May 28 2016 16:08:02

%S 1,1,2,7484400

%N Number of n-ary heaps on n levels (i.e., of A023037(n) elements).

%C a(5), a(6), a(7) have 1774, 31436, 625065 decimal digits, respectively.

%H Alois P. Heinz, <a href="/A273729/b273729.txt">Table of n, a(n) for n = 0..4</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/D-ary_heap">D-ary heap</a>

%F a(n) = A273712(n,n).

%Y Main diagonal of A273712.

%Y Cf. A023037.

%K nonn

%O 0,3

%A _Alois P. Heinz_, May 28 2016