Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 5 6 or 8 and every 3X3 column and antidiagonal sum not equal to 0 3 5 6 or 8.
A252610
Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 5 6 or 8 and every 3X3 column and antidiagonal sum not equal to 0 3 5 6 or 8.
Terms
- a(0) =1717a(1) =2815a(2) =7031a(3) =15119a(4) =51614a(5) =153189a(6) =342559a(7) =1193633a(8) =3615116a(9) =8087690a(10) =28540149a(11) =86930370a(12) =193559058a(13) =689795782a(14) =2109640661a(15) =4677334735a(16) =16803139847a(17) =51555232564a(18) =113908588386a(19) =411856910255
External references
- oeis: A252610