Number of (n+2)X(7+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.
A252557
Number of (n+2)X(7+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) =13917a(1) =42359a(2) =189777a(3) =902276a(4) =5882014a(5) =28350064a(6) =145399017a(7) =892449409a(8) =4324294849a(9) =22587330627a(10) =136612383229a(11) =662365987492
External references
- oeis: A252557