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A210831
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Number of (n+1) X (n+1) 0..3 symmetric matrices with every 2 X 2 subblock having two or three distinct values, and new values 0..3 introduced in lower triangle row major order.
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0
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4, 141, 25169, 16941289, 40820607681, 350983455561087, 10767951776455515799, 1178739099906082214413048, 460405515303453536692441783335, 641654973151502496777935760164666385
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