a(n) = (1/2) * (number of n X n 0..10 matrices with MM' mod 11 = I).

A071309

a(n) = (1/2) * (number of n X n 0..10 matrices with MM' mod 11 = I).

Terms

    a(0) =1a(1) =12a(2) =1320a(3) =1742400a(4) =25721308800

External references