Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 or 4.

A252082

Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 or 4.

Terms

    a(0) =130a(1) =322a(2) =943a(3) =2595a(4) =7089a(5) =19910a(6) =55703a(7) =155266a(8) =434540a(9) =1216413a(10) =3402605a(11) =9524573a(12) =26668604a(13) =74669305a(14) =209114056a(15) =585748112a(16) =1640928543a(17) =4597673521a(18) =12884229439a(19) =36111198006a(20) =101225635011a(21) =283795383806a(22) =795763649138

External references