

A221485


Number of 3Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction


1



0, 16, 50, 1407, 11784, 182524, 2017564, 26614749, 319184574, 4025795483, 49427052472, 615583634915, 7608564525014, 94422452015321, 1169266780165296, 14496003421951958, 179605335059387526, 2226026121739586735
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