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A071308
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a(n) = (1/2) * (number of n X n 0..9 matrices with MM' mod 10 = I).
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8
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1, 8, 720, 691200, 6739200000, 668528640000000, 663347543040000000000, 6622861869711360000000000000, 660754650163765248000000000000000000, 660543208675712843120640000000000000000000000, 6601093143555139842468151296000000000000000000000000000
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OFFSET
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1,2
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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