Number of (4+2)X(n+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.
A252619
Number of (4+2)X(n+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) =1635a(1) =5304a(2) =15119a(3) =43595a(4) =147592a(5) =433665a(6) =1358948a(7) =4510703a(8) =13168210a(9) =41784191a(10) =138318568a(11) =403291980a(12) =1282563188a(13) =4244649464a(14) =12367849652a(15) =39358997579a(16) =130295588917a(17) =379413675833
External references
- oeis: A252619