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A210828
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Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one or two distinct values, and new values 0..3 introduced in lower triangle row major order
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0
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4, 47, 1307, 77587, 9532771, 2382934915, 1203182006883, 1223431341113467, 2503405292687579547, 10310784667022325909483, 85532677566328699199301659, 1430104344703313378401501706139, 48228702523491961059131488089168571
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