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A221892
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Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops or left turns
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1
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0, 0, 0, 202, 2722, 31881, 416630, 5496803, 71900708, 940934266, 12320347932, 161293030438, 2111496138082, 27642157184325, 361871500036368, 4737358281430753, 62018044719943396, 811895156827216792
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