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A178012
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Number of permutations of 2 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/2)] (2-way heap).
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0
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1, 2, 7, 44, 394, 5160, 95772, 2070282, 54033576, 1768770384, 74057667588, 3481862274120
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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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