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A210854
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Number of (n+1)X(n+1) 0..2 symmetric matrices with every 2X2 subblock having two distinct values, and new values 0..2 introduced in lower triangle row major order
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1
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3, 28, 448, 12224, 582976, 48752256, 7203712512, 1886877853824, 879055341435904, 730130107330428544, 1083358734004347000832, 2876398810379833776444288, 13684686772466101305358053248, 116800507250117278015849838491776
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