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A210898
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Number of nXn 0..2 symmetric matrices with every element equal to zero 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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1, 3, 17, 199, 3494, 98664, 4322895, 299203520, 32406437104, 5516394350943, 1472647280151852, 617087491407309762, 405686597596735406852
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