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A180069
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Number of permutations of 1..n with the sum of squared adjacent differences < n*(n-1)/2
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0
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0, 2, 2, 6, 34, 132, 448, 1986, 8422, 39902, 195946, 1024366, 5505428, 31185644, 183904498, 1119250852, 7025176096
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