Number of (n+2)X(6+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.

A251903

Number of (n+2)X(6+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) =16532a(1) =6744a(2) =10662a(3) =17976a(4) =61686a(5) =120984a(6) =202792a(7) =630776a(8) =1468994a(9) =2840656a(10) =8027990a(11) =18516064a(12) =42612832a(13) =111147008a(14) =273800018a(15) =630687800a(16) =1708859106a(17) =4099448632a(18) =10295037848a(19) =25879630320a(20) =66847115882a(21) =161547812864

External references