A111485 Number of (-1,0,1) periodic irreducible matrices up to sign change, transposition and mirroring over the antidiagonal.

1, 3, 12, 107, 951, 10923

Offset: 1

Author

Wouter Meeussen, Nov 15 2005

Keywords

• hard
• nonn

Comments

"Irreducible" is intended to mean "not factoring into blocks along the diagonal". The periods for n=6 are 396 times period 3, 2939 times period 4, 1684 times period 6 and 5904 times period 12.

Links

• Wouter Meeussen, Periodic
• Eric Weisstein's World of Mathematics, Periodic Matrices

Crossrefs

Cf. A072148.