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A052140
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4^n*n!^2*Sum_{k=0..n} 1/k!.
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0
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1, 8, 160, 6144, 399360, 40058880, 5771427840, 1131282432000, 289610945003520, 93834041307955200, 37533620328254668800, 18166272406298453606400, 10463772914064222584832000, 7073510490325302759338803200, 5545632224438439107673194496000
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OFFSET
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0,2
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REFERENCES
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R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 5.64(d).
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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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