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A175176
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Number of vector sums of two permutations of 1,2,...,n.
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0
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OFFSET
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1,2
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COMMENTS
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Also, number of vector differences of two permutations of 1,2,...,n.
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LINKS
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Table of n, a(n) for n=1..10.
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EXAMPLE
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The permutation sums for n=2 are (1,2) + (1,2) = (2,4); (1,2) + (2,1) = (2,1) + (1,2) = (3,3); (2,1) + (2,1) = (4,2); so a(2)=3.
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CROSSREFS
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Sequence in context: A288693 A195895 A127502 * A233336 A208897 A027546
Adjacent sequences: A175173 A175174 A175175 * A175177 A175178 A175179
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KEYWORD
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nonn,more
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AUTHOR
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R. H. Hardin Feb 28 2010
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STATUS
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approved
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