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A210811
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Number of (n+1)X(n+1) 0..2 symmetric matrices containing all values 0..2 with every 2X2 subblock having two or three distinct values, and new values 0..2 introduced in lower triangle row major order
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1
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1, 77, 6229, 1262225, 726073329, 1209785791625, 5850732086362939, 82137353908070795417, 3347356112526068595635969, 395998823277249889265284827949, 135993026862887326817175277464490671
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