A071307 1/2 number of n X n 0..8 matrices with MM' mod 9 = I.

1, 12, 648, 419904, 3061100160

Offset

1,2

Links

Table of n, a(n) for n=1..5.

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

Adjacent sequences: A071304 A071305 A071306 * A071308 A071309 A071310

Keyword

nonn,more

Author

R. H. Hardin, Jun 11 2002

Status

approved