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A178014
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Number of permutations of 2 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/4)] (4-way heap)
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0
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1, 3, 18, 189, 3000, 84060, 2799360, 148771080, 8457799680, 727583990400, 53828906153760
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OFFSET
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1,2
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LINKS
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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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