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A052373
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Number of nonnegative integer 7x7 matrices with sum of elements equal to n, under row and column permutations.
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1
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1, 1, 4, 10, 33, 91, 298, 910, 2974, 9655, 32287, 108274, 367489, 1246921, 4229171, 14246120, 47542245, 156588539, 507914513, 1618965097, 5064384168, 15531406244, 46670874679, 137372332583, 396053582039, 1118577433593
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