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Number of nX6 0..3 arrays with no element equal to another within two positions in the same row or column, and new values 0..3 introduced in row major order
1

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

%S 8,376,2816,24492,213788,1915580,17277556,156946368,1429962032,

%T 13057140562,119353104128,1091748256156,9990044761998,91434371494388,

%U 836958605238016,7661779056726008,70141114109343664,642134221496445414

%N Number of nX6 0..3 arrays with no element equal to another within two positions in the same row or column, and new values 0..3 introduced in row major order

%C Column 6 of A206692

%H R. H. Hardin, <a href="/A206690/b206690.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 11 2012