a(n) = (1/2) * (number of n X n 0..5 matrices M with MM' mod 6 = I, where M' is the transpose of M and I is the n X n identity matrix).

A071305

a(n) = (1/2) * (number of n X n 0..5 matrices M with MM' mod 6 = I, where M' is the transpose of M and I is the n X n identity matrix).

Terms

    a(0) =1a(1) =8a(2) =144a(3) =27648a(4) =37324800a(5) =300987187200

External references