OFFSET
1,2
REFERENCES
I. Reiner, On the number of matrices with given characteristic polynomial, Illinois J. Math. 5 1961 324-329.
FORMULA
a(n) = (q/(q-1))*(q^(n^2-n)-q^(-2*n+n^2)) where q = 2.
PROG
(PARI) a(n)=(2^n-1)<<(n^2-2*n+1) \\ Charles R Greathouse IV, Oct 04 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Yuval Dekel (dekelyuval(AT)hotmail.com) and W. Edwin Clark, Nov 29 2003
EXTENSIONS
More terms from Joerg Arndt, Oct 04 2013
STATUS
approved