A273729 Number of n-ary heaps on n levels (i.e., of A023037(n) elements).

1, 1, 2, 7484400

Offset: 0

Author

Alois P. Heinz, May 28 2016

Keywords

• nonn

Comments

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

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..4
• Wikipedia, D-ary heap

Crossrefs

Main diagonal of A273712.

Cf. A023037.

Formula

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