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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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..11.
FORMULA
a(n) = A003053(n) * A071304(n). - Max Alekseyev, Nov 06 2022
CROSSREFS
Cf. A003053, A071302, A071303, A071304, A071305, A071306, A071307, A071309, A071310.
Sequence in context: A361222 A277860 A221198 * A046188 A014387 A220641
Adjacent sequences: A071305 A071306 A071307 * A071309 A071310 A071311
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 11 2002
EXTENSIONS
Terms a(6) onward from Max Alekseyev, Nov 06 2022
STATUS
approved

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Last modified May 15 18:29 EDT 2024. Contains 372549 sequences. (Running on oeis4.)