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EXAMPLE
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a(7) = 4522151204857137264:
[ 1, 4, 15, 32, 65, 108, 175]
[ 4, 15, 32, 65, 108, 175, 256]
[ 15, 32, 65, 108, 175, 256, 369]
[ 32, 65, 108, 175, 256, 369, 500]
[ 65, 108, 175, 256, 369, 500, 671]
[108, 175, 256, 369, 500, 671, 864]
[175, 256, 369, 500, 671, 864, 1105]
which is the singular matrix M of minimal order.
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