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A323962
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Number of defective (binary) heaps on n elements with exactly six defects.
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2
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0, 80, 1526, 34160, 576060, 8762880, 123760560, 1602344832, 21025461600, 264121228800, 3365570435040, 42633973724160, 535972460752320, 7005009151595520, 88526770797830400, 1212423433054986240, 15530632515845568000, 223695310100356300800, 2930160761881213132800
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OFFSET
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6,2
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COMMENTS
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Or number of permutations p of [n] having exactly six indices i in {1,...,n} such that p(i) > p(floor(i/2)).
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LINKS
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Eric Weisstein's World of Mathematics, Heap
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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