Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 2 or 5.

A252599

Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 2 or 5.

Terms

    a(0) =567a(1) =1151a(2) =2784a(3) =6978a(4) =18454a(5) =49782a(6) =136336a(7) =380466a(8) =1070438a(9) =3029761a(10) =8627013a(11) =24630825a(12) =70475042a(13) =202058195a(14) =579821752a(15) =1665118858a(16) =4785253832a(17) =13755703417a(18) =39553064198a(19) =113760165084a(20) =327218002791a(21) =941299811884

External references