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A210919
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Number of n X n 0..3 symmetric matrices with every element equal to zero or one horizontal and vertical neighbor, and new values 0..3 introduced in lower triangle row major order
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0
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1, 2, 50, 5036, 1650722, 1726180511, 5772723512117, 61704243727319597, 2108342605082097217766, 230275999931688657463304318, 80396959992514189225966415632361
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