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A221422
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Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two
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1
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0, 16, 150, 1766, 17792, 193809, 2026142, 21225843, 221800513, 2315560756, 24158793461, 251974356335, 2627599071035, 27398017417265, 285664044010997, 2978372739958617, 31052414113756762, 323748492991437021
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