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A204299
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Number of nX6 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1, and 2 introduced before 3 in row major order
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1
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0, 212, 19540, 1972288, 277234340, 47309058644, 5589659640640, 870640738340900, 123996249589648356, 17750283049298827840, 2576653369311868344772, 370733913903692365171892, 53509487787359717704828880
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