|
|
A111485
|
|
Number of (-1,0,1) periodic irreducible matrices up to sign change, transposition and mirroring over the antidiagonal.
|
|
1
|
|
|
|
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
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
hard,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|