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A159357
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Number of n X n arrays of squares of integers with every (n-2)X(n-2) subblock summing to 4
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1
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13, 3223, 120420, 1313859, 7979037, 34212213, 116257928, 334277285, 847224269, 1945263907, 4124812588, 8191927383, 15400417725, 27631699329, 47624056752, 79259627513, 127918067213, 200906501615, 307976018164, 461935595947
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