  We describe a class of matrices whose determinants are trivial to compute. A
nice example of such a matrix is given by considering the symmetric matrix with
entries {i+j choose i} (mod 2) in {0,1}, 0 <= i,j < n the binomial coefficients
modulo 2 represented by {0,1}. The determinant of the above matrix is then
closely related to the Thue-Morse sequence counting digits modulo 2 of binary
integers.
