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A193808
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Number of n X n symmetric 0..3 arrays with no element equal to the difference mod 4 of any two of its horizontal and vertical neighbors
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1
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4, 23, 133, 1465, 37741, 2194501, 271424321, 68861945361, 35194944674859, 36030017205738273, 73787195288621907455, 302231516037239516908817, 2475880105112954130388596401, 40564819225226093549492737413585
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