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Generating function in Maple format
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First 15 coefficients

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19 Results

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Av(123, 321) Av(123, 231, 1432, 2143, 4321) Av(123, 231, 2143, 4132, 4321) Av(123, 231, 2143, 4312, 4321) Av(123, 132, 3214, 3241, 3412, 4321) Av(123, 132, 3214, 3412, 3421, 4321) Av(123, 132, 3214, 3412, 4231, 4321) Av(123, 132, 3214, 3421, 4312, 4321) Av(123, 132, 3241, 3412, 3421, 4321) Av(123, 132, 3241, 3412, 4213, 4321) Av(123, 132, 3241, 3412, 4231, 4321) Av(123, 132, 3241, 3412, 4312, 4321) Av(123, 132, 3241, 3421, 4231, 4321) Av(123, 132, 3241, 3421, 4312, 4321) Av(123, 132, 3412, 3421, 4231, 4321) Av(123, 132, 3412, 3421, 4312, 4321) Av(123, 132, 3421, 4231, 4312, 4321) Av(132, 231, 1234, 2134, 4312, 4321) Av(132, 231, 1234, 3214, 4123, 4321)