a(n) is the permanent of the n X n matrix M(n) that is defined by M[i,j] = i*j - ceiling(i*j/3).

A358163

a(n) is the permanent of the n X n matrix M(n) that is defined by M[i,j] = i*j - ceiling(i*j/3).

Terms

    a(0) =1a(1) =0a(2) =1a(3) =30a(4) =1272a(5) =113224a(6) =18615680a(7) =4299553536

External references