OFFSET
1,2
COMMENTS
a(n) is the size of the conjugacy class in GL(n,GF(2)) corresponding to the companion matrix of x^n - 1. It can be given by the number of n X n invertible matrices over GF(2) divided by the number of n X n circulant invertible matrices over GF(2) (i.e., the centralizer of the companion matrix of x^n - 1).
CROSSREFS
KEYWORD
nonn
AUTHOR
Christof Beierle, Jun 24 2020
STATUS
approved