8,2

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

Alois P. Heinz, Table of n, a(n) for n = 8..200

Eric Weisstein's World of Mathematics, Heap

Wikipedia, Binary heap

Column k=8 of A306343.

Cf. A056971.

Sequence in context: A218814 A264329 A287944 * A145498 A252378 A210129

Adjacent sequences: A323961 A323962 A323963 * A323965 A323966 A323967

nonn

Alois P. Heinz, Feb 09 2019

approved