A071307 1/2 number of n X n 0..8 matrices with MM' mod 9 = I.
1, 12, 648, 419904, 3061100160
Offset: 1
Crossrefs
Cf. A071302.
Formula
Conjecture: a(n) = 3^(n*(n-1)/2) * A071302(n) for n >= 1. - Michel Marcus, Nov 08 2022
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