Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.
A252195
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.
Terms
- a(0) =585a(1) =470a(2) =669a(3) =1313a(4) =3201a(5) =8526a(6) =23265a(7) =63626a(8) =174878a(9) =481751a(10) =1326853a(11) =3654591a(12) =10068350a(13) =27738291a(14) =76416644a(15) =210524622a(16) =579990251a(17) =1597852801a(18) =4402028111a(19) =12127445456a(20) =33410714513a(21) =92045405856a(22) =253582052916a(23) =698610194687
External references
- oeis: A252195