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A323965 Number of defective (binary) heaps on n elements with exactly nine defects. 2
0, 3360, 190800, 6837600, 239978112, 6268548000, 153775564800, 3365570435040, 69086614338560, 1386261729792960, 26344715667079680, 502986050203680000, 9251596509192069120, 171657357483560256000, 3142069546022259916800, 57414248711716723200000 (list; graph; refs; listen; history; text; internal format)
OFFSET

9,2

COMMENTS

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

LINKS

Alois P. Heinz, Table of n, a(n) for n = 9..200

Eric Weisstein's World of Mathematics, Heap

Wikipedia, Binary heap

CROSSREFS

Column k=9 of A306343.

Cf. A056971.

Sequence in context: A222154 A159000 A032773 * A223295 A115488 A020434

Adjacent sequences:  A323962 A323963 A323964 * A323966 A323967 A323968

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Feb 09 2019

STATUS

approved

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Last modified June 16 06:46 EDT 2019. Contains 324145 sequences. (Running on oeis4.)