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A323966 Number of defective (binary) heaps on n elements with exactly ten defects. 2
0, 19200, 947760, 49680576, 1744142400, 60169824000, 1646888944800, 42633973724160, 1013373907056960, 22797317814635520, 502986050203680000, 10556482426015426560, 222685725334400064000, 4535040919258899456000, 92995172484979478630400, 1880492299058130490163200 (list; graph; refs; listen; history; text; internal format)
OFFSET

10,2

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.

Sequence in context: A249106 A184196 A210316 * A035925 A186875 A251803

Adjacent sequences:  A323963 A323964 A323965 * A323967 A323968 A323969

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Feb 09 2019

STATUS

approved

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Last modified June 18 07:37 EDT 2019. Contains 324203 sequences. (Running on oeis4.)