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A210856
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Number of (n+1)X(n+1) 0..2 symmetric matrices with every 2X2 subblock having one or three distinct values, and new values 0..2 introduced in lower triangle row major order
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0
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2, 7, 52, 653, 13626, 466059, 26123304, 2397815265, 360393055118, 88675989046143, 35717797661887220, 23549404183669259509, 25414418850237694865002
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