A323966 Number of defective (binary) heaps on n elements with exactly ten defects.

0, 19200, 947760, 49680576, 1744142400, 60169824000, 1646888944800, 42633973724160, 1013373907056960, 22797317814635520, 502986050203680000, 10556482426015426560, 222685725334400064000, 4535040919258899456000, 92995172484979478630400, 1880492299058130490163200

Offset: 10

Author

Alois P. Heinz, Feb 09 2019

Keywords

• nonn

Comments

Or number of permutations p of [n] having exactly ten indices i in {1,...,n} such that p(i) > p(floor(i/2)).

Links

• Alois P. Heinz, Table of n, a(n) for n = 10..200
• Eric Weisstein's World of Mathematics, Heap
• Wikipedia, Binary heap

Crossrefs

Column k=10 of A306343.

Cf. A056971.