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A210923
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Number of n X n 0..3 symmetric matrices with every element equal to zero, one or two horizontal and vertical neighbors, and new values 0..3 introduced in lower triangle row major order
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1
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1, 5, 166, 35207, 30211455, 99371076165, 1250065064815292, 60143467055359131310, 11066941546543240934864887, 7788436930452056534815427874703, 20963150916521213172749181596782816735
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