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

1,2

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

Table of n, a(n) for n=1..6.

Wouter Meeussen, Periodic

Eric Weisstein's World of Mathematics, Periodic Matrices

Crossrefs

Cf. A072148.

Sequence in context: A141535 A324313 A377578 * A293126 A080447 A127059

Adjacent sequences: A111482 A111483 A111484 * A111486 A111487 A111488

Keyword

hard,nonn

Author

Wouter Meeussen, Nov 15 2005

Status

approved