login
A071307
1/2 number of n X n 0..8 matrices with MM' mod 9 = I.
9
1, 12, 648, 419904, 3061100160
OFFSET
1,2
FORMULA
Conjecture: a(n) = 3^(n*(n-1)/2) * A071302(n) for n >= 1. - Michel Marcus, Nov 08 2022
CROSSREFS
Cf. A071302.
Sequence in context: A220992 A241227 A268549 * A195574 A195554 A220327
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Jun 11 2002
STATUS
approved