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Number of nX5 binary arrays with each sum of a(1..i,1..j) no greater than i*j/2
1

%I #5 Mar 31 2012 12:35:51

%S 10,260,5354,154079,3770481,112353512,2965955665,89945894383,

%T 2477411142245,75930571035939,2148890776573534,66330562852888061,

%U 1912878564502004446,59346407547808417447,1735296847301030887989

%N Number of nX5 binary arrays with each sum of a(1..i,1..j) no greater than i*j/2

%C Column 5 of A183407

%H R. H. Hardin, <a href="/A183406/b183406.txt">Table of n, a(n) for n = 1..16</a>

%e Some solutions for 4X5

%e ..0..0..0..1..0....0..1..0..1..0....0..0..1..0..0....0..0..1..1..0

%e ..0..0..0..0..1....0..1..1..0..0....0..1..0..0..0....0..1..0..1..1

%e ..0..0..0..0..0....0..0..0..0..0....1..0..0..1..1....1..0..0..0..1

%e ..0..0..1..1..1....0..1..1..1..0....0..0..1..1..1....1..0..0..0..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 04 2011