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A210924
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Number of n X n 0..3 symmetric matrices with every element equal to zero, one or three 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, 2, 50, 5280, 1845589, 2131393730, 8110404963737, 101713393925588269, 4204356938900447492681, 572796548087149263352167089, 257205150385663723399847224344969
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