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A323964
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Number of defective (binary) heaps on n elements with exactly eight defects;
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2
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0, 896, 32460, 1201920, 29987760, 705522048, 14197154400, 264121228800, 4765553385120, 80958196300800, 1386261729792960, 22797317814635520, 378396940680172800, 6210934579834490880, 101592763596409536000, 1694705349980956262400, 27653450672540750745600
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OFFSET
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8,2
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COMMENTS
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Or number of permutations p of [n] having exactly eight 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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