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A323963 Number of defective (binary) heaps on n elements with exactly seven defects. 2
0, 210, 7616, 185460, 4200960, 77887920, 1310267904, 21025461600, 314958758400, 4765553385120, 69086614338560, 1013373907056960, 14714554645140480, 212868974122848000, 3168605413206097920, 45787509175434048000, 705241846739554713600, 10297540417675899801600 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

COMMENTS

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

LINKS

Alois P. Heinz, Table of n, a(n) for n = 7..200

Eric Weisstein's World of Mathematics, Heap

Wikipedia, Binary heap

CROSSREFS

Column k=7 of A306343.

Cf. A056971.

Sequence in context: A061133 A087977 A185042 * A023905 A035840 A140904

Adjacent sequences:  A323960 A323961 A323962 * A323964 A323965 A323966

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Feb 09 2019

STATUS

approved

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Last modified July 16 04:09 EDT 2019. Contains 325064 sequences. (Running on oeis4.)