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A210907
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Number of n X n 0..2 symmetric matrices with every element equal to one or two horizontal and vertical neighbors, and new values 0..2 introduced in lower triangle row major order
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0
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0, 1, 2, 51, 1726, 153098, 28152650, 11567939904, 10468180657260, 20883980738963652, 92033224229940826385, 894504588855167462245204
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