login
Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4
0

%I #4 Dec 16 2014 13:06:38

%S 564,1920,8208,68320,1227461,41069194,2178722578,178658210404,

%T 22705656001038,4445145404367921

%N Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4

%C Diagonal of A252293

%e Some solutions for n=4

%e ..2..1..2..2..2..2....2..2..2..1..2..2....2..2..2..2..1..0....1..0..1..1..1..0

%e ..2..2..2..1..2..2....2..1..2..2..2..2....2..1..2..2..2..1....1..1..1..1..1..1

%e ..1..2..2..2..2..2....2..2..2..2..2..2....2..2..2..1..2..2....1..1..0..1..1..1

%e ..2..2..2..2..2..2....2..2..2..2..2..2....2..2..2..2..2..2....1..1..1..1..1..0

%e ..2..2..2..2..2..2....2..2..2..2..1..2....1..2..2..2..2..2....1..1..1..1..1..1

%e ..1..2..2..2..1..2....1..2..2..2..2..2....2..2..1..2..2..2....1..0..1..1..0..1

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 16 2014