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A221127
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Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor
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1
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1, 144, 4872, 179300, 6405243, 229006550, 8187649472, 292733110656, 10466092166432, 374194374753326, 13378578012147801, 478324533007616827, 17101545371715018992, 611431849960750401963, 21860533596256955469254
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