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COMMENTS
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The determinant of this 8 X 8 matrix is a(8) = 56:
{0, 1, 1, 1, 0, 1, 0, 0},
{1, 0, 1, 1, 0, 1, 0, 0},
{1, 1, 0, 1, 0, 0, 1, 1},
{1, 1, 1, 0, 1, 0, 0, 1},
{0, 0, 0, 1, 1, 1, 0, 1},
{1, 1, 0, 0, 1, 1, 1, 0},
{0, 0, 1, 0, 0, 1, 1, 1},
{0, 0, 1, 1, 1, 0, 1, 0}
and the determinant of this 9 X 9 matrix is a(9) = 144:
{1, 1, 0, 1, 1, 0, 0, 1, 1},
{1, 1, 1, 1, 0, 1, 0, 0, 0},
{0, 1, 1, 1, 0, 0, 1, 1, 1},
{1, 1, 1, 0, 1, 0, 1, 0, 1},
{1, 0, 0, 1, 0, 1, 1, 0, 1},
{0, 1, 0, 0, 1, 1, 1, 1, 0},
{0, 0, 1, 1, 1, 1, 0, 0, 1},
{1, 0, 1, 0, 0, 1, 0, 1, 1},
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