Number of n X n 0..2 matrices with all row and column sums equal.

A067210

Number of n X n 0..2 matrices with all row and column sums equal.

Terms

    a(0) =1a(1) =3a(2) =9a(3) =87a(4) =5673a(5) =2577513a(6) =8459809773

External references