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A071308
a(n) = (1/2) * (number of n X n 0..9 matrices with MM' mod 10 = I).
8
1, 8, 720, 691200, 6739200000, 668528640000000, 663347543040000000000, 6622861869711360000000000000, 660754650163765248000000000000000000, 660543208675712843120640000000000000000000000, 6601093143555139842468151296000000000000000000000000000
OFFSET
1,2
FORMULA
a(n) = A003053(n) * A071304(n). - Max Alekseyev, Nov 06 2022
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 11 2002
EXTENSIONS
Terms a(6) onward from Max Alekseyev, Nov 06 2022
STATUS
approved