Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum unequal to 4 or 5 and every diagonal and antidiagonal sum equal to 4 or 5.

A251904

Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum unequal to 4 or 5 and every diagonal and antidiagonal sum equal to 4 or 5.

Terms

    a(0) =23868a(1) =9830a(2) =16848a(3) =28288a(4) =101508a(5) =202792a(6) =325504a(7) =1183404a(8) =2519780a(9) =4658222a(10) =15724032a(11) =35357236a(12) =72617464a(13) =229816136a(14) =549341468a(15) =1254019770a(16) =3754851816a(17) =9453776420a(18) =23234277672a(19) =66855509068a(20) =174358076576a(21) =450572667250

External references