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A221246
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Number of 2 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor.
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1
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0, 9, 50, 484, 3864, 32400, 267264, 2214144, 18316800, 151585344, 1254325824, 10379534400, 85889605824, 710729930304, 5881230244800, 48666696727104, 402712880117184, 3332415765326400, 27575464553486784, 228184686537228864
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