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A202681
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Number of nX3 0..3 arrays with row sums equal and column sums equal
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1
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4, 16, 340, 832, 6784, 224764, 496276, 4373632, 231072928, 353406676, 3224421556, 280342927660, 274352334052, 2553096089392, 372538530340720, 224184063052672, 2113024132266112, 524189682100412404, 189520876535392852
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