Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 4 6 or 7.
A252556
Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 4 6 or 7.
Terms
- a(0) =7755a(1) =21797a(2) =88899a(3) =386004a(4) =2464176a(5) =11035929a(6) =52263770a(7) =332967343a(8) =1520737989a(9) =7411561448a(10) =47936540751a(11) =220824503814
External references
- oeis: A252556