Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.

A252151

Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.

Terms

    a(0) =1945a(1) =1874a(2) =1898a(3) =2702a(4) =4732a(5) =8769a(6) =16786a(7) =32653a(8) =64082a(9) =126281a(10) =249972a(11) =496351a(12) =987018a(13) =1965441a(14) =3918468a(15) =7816699a(16) =15602898a(17) =31159889a(18) =62243052a(19) =124369539a(20) =248564606a(21) =496831189a(22) =993205780a(23) =1985726667a(24) =3970284238a(25) =7938763405

External references