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A323962 Number of defective (binary) heaps on n elements with exactly six defects. 2
0, 80, 1526, 34160, 576060, 8762880, 123760560, 1602344832, 21025461600, 264121228800, 3365570435040, 42633973724160, 535972460752320, 7005009151595520, 88526770797830400, 1212423433054986240, 15530632515845568000, 223695310100356300800, 2930160761881213132800 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

COMMENTS

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

LINKS

Alois P. Heinz, Table of n, a(n) for n = 6..200

Eric Weisstein's World of Mathematics, Heap

Wikipedia, Binary heap

CROSSREFS

Column k=6 of A306343.

Cf. A056971.

Sequence in context: A204476 A151603 A199533 * A296189 A060623 A173782

Adjacent sequences:  A323959 A323960 A323961 * A323963 A323964 A323965

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Feb 09 2019

STATUS

approved

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Last modified October 23 20:09 EDT 2019. Contains 328373 sequences. (Running on oeis4.)