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A210857
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Number of (n+1)X(n+1) 0..2 symmetric matrices 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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4, 94, 6400, 1265336, 726175112, 1209791788480, 5850732722422240, 82137354029529991584, 3347356112567824150084288, 395998823277275732737683780672, 135993026862887355613684481546308800
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