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%I #4 Dec 03 2015 12:20:06
%S 1,1,1,1,4,1,2,21,21,2,16,139,2024,139,16,79,8463,170970,170970,8463,
%T 79,456,219995,7796840,36765048,7796840,219995,456,2194,6639203,
%U 1346956387,19256175024,19256175024,1346956387,6639203,2194,20801,149441692
%N T(n,k)=Number of nXk 0..n*k-1 arrays with upper left zero and lower right n*k-1 and each element differing from its horizontal and vertical neighbors by a power of two.
%C Table starts
%C ......1..........1..............1................2................16
%C ......1..........4.............21..............139..............8463
%C ......1.........21...........2024...........170970...........7796840
%C ......2........139.........170970.........36765048.......19256175024
%C .....16.......8463........7796840......19256175024....62221755947285
%C .....79.....219995.....1346956387....7187180809683.29140746691543180
%C ....456....6639203...226158945148.2362949716450873
%C ...2194..149441692.16064538255326
%C ..20801.6260685646
%C .142675
%H R. H. Hardin, <a href="/A265178/b265178.txt">Table of n, a(n) for n = 1..60</a>
%e Some solutions for n=3 k=4
%e ..0..2..6..8....0..8.10.11....0..8..0..2....0..8..9.11....0..2..0..2
%e ..8..0..2.10....4..6..8.10....4..6..2.10....2..6..8.10....4..6..2.10
%e ..6..8.10.11....0..8.10.11....8..4..3.11....6..7..9.11....6..5..3.11
%K nonn,tabl
%O 1,5
%A _R. H. Hardin_, Dec 03 2015
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