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A252948
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Number of (n+2)X(4+2) 0..2 arrays with every consecutive three elements in every row, column and nw-se diagonal having exactly two distinct values, and new values 0 upwards introduced in row major order
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1
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11943, 57978, 334197, 2101338, 13646115, 90331596, 603797472, 4053062745, 27261133281, 183573601551, 1236849898797, 8335733861484, 56186781207696, 378754028778393, 2553271491665079, 17212557055072455, 116037485548768206
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