A254970 - OEIS

%I #4 Feb 11 2015 10:09:29

%S 121,1282,49040,1892418,157053228,26791709738,7506000777648,

%T 3820686512324000,3744643102840746224,6548923551070930502468,

%U 20718929937864865377805260

%N Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 0 and no column sum 0

%C Diagonal of A254978

%e Some solutions for n=3

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 11 2015