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Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 7
0

%I #4 Dec 15 2014 07:47:13

%S 441,470,1647,21928,480526,16789626,896763106,73759241737,

%T 9393184984437,1838801806417542,553960321837762379,

%U 257519518174289401266,184540608154581393175482,203698879433082432079178181

%N Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 7

%C Diagonal of A252201

%e Some solutions for n=4

%e ..3..3..3..3..3..2....2..3..3..3..3..2....2..3..3..3..3..2....3..3..2..3..3..3

%e ..3..3..3..2..3..3....3..3..3..3..3..3....3..3..3..3..3..3....2..3..3..3..2..3

%e ..2..3..3..3..3..3....3..3..3..3..3..3....3..3..3..3..3..3....3..3..3..3..3..3

%e ..3..3..3..3..3..3....2..3..3..3..3..3....3..3..3..3..2..3....3..3..3..3..3..3

%e ..3..3..3..3..3..3....3..3..2..3..3..3....3..3..2..3..3..3....3..3..2..3..3..3

%e ..3..3..2..3..3..2....3..3..3..3..3..3....3..3..3..3..3..2....2..3..3..3..3..3

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 15 2014