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A210921
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Number of n X n 0..3 symmetric matrices with every element equal to zero or two horizontal and vertical neighbors, and new values 0..3 introduced in lower triangle row major order.
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0
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1, 3, 39, 2107, 277902, 87883641, 66460660741, 120226326939778, 520179215730042235, 5383068220104980704743, 133236771262960489496028245
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