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A167029
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Difference between the number of positive and negative terms in the expansion of a skew symmetric matrix of order n.
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0
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1, 0, 2, 0, 8, 0, 18, 0, 578, 0, -15460, 0, 1012512, 0, -81237604, 0, 8572174172, 0, -1139408178984, 0, 186543348044576, 0
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