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A178015
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Number of permutations of 2 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/5)] (5-way heap)
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0
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1, 3, 30, 246, 5400, 134550, 5380020, 379593000, 18277228800, 1895009299200, 171982733220000, 21945548042928000
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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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