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A147890
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Number of permutations of floor(i*9/5), i=0..n-1, with all sums of two adjacent terms unique.
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0
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1, 2, 6, 24, 96, 444, 3172, 16976, 112790, 839320, 7525858, 86947336, 816752748, 8170308628, 90956874778, 1199823762964
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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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