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

A358161

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

Terms

    a(0) =1a(1) =1a(2) =3a(3) =19a(4) =434a(5) =18142a(6) =1138592a(7) =131646240a(8) =22247821152

External references