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Number of 4Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns
0

%I #3 Jan 26 2013 07:17:21

%S 0,40,379,29412,854959,35948127,1290833232,49447514716,1844208808987,

%T 69554410132666,2610306743813999,98167800387966673

%N Number of 4Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns

%C Row 4 of A221817

%e Some solutions for n=3

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 26 2013