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Number of (n+3)X(n+3) 0..3 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero
0

%I #4 Nov 03 2013 05:59:20

%S 6,242,8374,3160834,584293702,1576885946694,2042677948725090,

%T 36336036129055657778

%N Number of (n+3)X(n+3) 0..3 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero

%C Diagonal of A231023

%e Some solutions for n=2

%e ..x..0..x..1..x....x..0..x..2..x....x..0..x..3..x....x..0..x..0..x

%e ..1..x..3..x..2....2..x..1..x..3....1..x..0..x..2....3..x..1..x..0

%e ..x..2..x..3..x....x..3..x..0..x....x..2..x..1..x....x..2..x..1..x

%e ..1..x..0..x..2....0..x..2..x..3....1..x..3..x..1....1..x..0..x..2

%e ..x..3..x..1..x....x..1..x..2..x....x..0..x..2..x....x..3..x..3..x

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 03 2013