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A069580
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Noninvertible n X n matrices mod 4 (i.e., over the ring Z_4).
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1
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2, 160, 176128, 2973761536, 790377061679104, 3337070496489549070336, 224673304169436873829314985984, 241628003280411784073600553618302304256, 4154447778684876644944282114016459737751307157504
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