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A131705
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Phi(binomial(2*n,n)*n^3).
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0
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0, 1, 16, 144, 1536, 7200, 51840, 282240, 1474560, 7464960, 55296000, 200724480, 1051066368, 6167715840, 21459271680, 114960384000, 523197480960, 2214903398400, 9311791104000, 41500698624000, 183936614400000
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