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A215257
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Number of indecomposable permutations sortable by a double-ended queue.
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4
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0, 1, 1, 3, 13, 67, 383, 2345, 15069, 100341, 686515, 4797997, 34110765, 245926667, 1793867881, 13214905229, 98177212059, 734746226575, 5534054981071, 41917876423855, 319102504087883, 2440086947417629, 18733909260242195, 144354928765952131, 1116015033661158079, 8654019249571514621, 67292250859412467583, 524583875375437922949
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OFFSET
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0,4
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COMMENTS
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Suggested by Peter Doyle in an email message, Sep 04 2012
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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