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Number of nX4 0..3 arrays avoiding the pattern z-2 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal
1

%I #5 Mar 31 2012 12:37:13

%S 241,58081,11091161,2152805235,413843625776,79716622309437,

%T 15348900754966668,2955760887154751440,569180485178587224840,

%U 109606019483652083444194,21106586871668692105099671

%N Number of nX4 0..3 arrays avoiding the pattern z-2 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal

%C Column 4 of A206838

%H R. H. Hardin, <a href="/A206834/b206834.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 13 2012