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A324068
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Number of defective (binary) heaps on n elements where seven ancestor-successor pairs do not have the correct order.
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2
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0, 0, 0, 0, 0, 0, 60, 640, 5040, 39424, 315840, 2572800, 22730400, 207820800, 1979577600, 20119756800, 180756576000, 1740900761600, 17732095180800, 197872975872000, 2123068147200000, 24858537099264000, 303091124244480000, 4076808466857984000
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OFFSET
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0,7
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COMMENTS
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Or number of permutations p of [n] having exactly seven pairs (i,j) in {1,...,n} X {1,...,floor(log_2(i))} such that p(i) > p(floor(i/2^j)).
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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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