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%I #5 Mar 31 2012 12:36:49
%S 4,12,12,36,184,36,108,2428,2428,108,324,32676,143028,32676,324,972,
%T 443100,8196796,8196796,443100,972,2916,5967248,464590190,1960824272,
%U 464590190,5967248,2916,8748,80018540,26143599304,459796683544
%N T(n,k)=Number of nXk 0..3 arrays with adjacent row and column sums unequal
%C Table starts
%C .....4.........12............36.............108.............324.............972
%C ....12........184..........2428...........32676..........443100.........5967248
%C ....36.......2428........143028.........8196796.......464590190.....26143599304
%C ...108......32676.......8196796......1960824272....459796683544.106682611433736
%C ...324.....443100.....464590190....459796683544.443471777729100
%C ...972....5967248...26143599304.106682611433736
%C ..2916...80018540.1464347535012
%C ..8748.1071819720
%C .26244
%H R. H. Hardin, <a href="/A202636/b202636.txt">Table of n, a(n) for n = 1..49</a>
%e Some solutions for n=3 k=3
%e ..2..3..0....0..2..2....0..1..1....3..2..2....2..2..0....3..2..1....2..3..2
%e ..3..3..1....0..1..1....0..0..1....1..2..3....2..3..3....2..0..1....3..1..2
%e ..0..1..0....3..1..2....2..2..0....0..1..2....1..3..2....2..3..1....0..0..2
%K nonn,tabl
%O 1,1
%A _R. H. Hardin_ Dec 21 2011