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A147917
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Number of permutations of floor(i*4/3), 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, 74, 368, 2140, 11468, 78848, 636700, 4866484, 43893944, 452631554, 4475626268, 50128776656, 625960035472
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