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A187696
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Number of (n+1)X(n+1) 0..1 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection
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0
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6, 0, 104, 0, 9350, 0, 4280018, 0, 9966761956, 0, 118224466422070, 0, 7149599148533804130, 0, 2205540801307910506482568, 0
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