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A183412 Number of nX5 binary arrays with each sum of a(1..i,1..j) no greater than i*j/2 and rows and columns in nondecreasing order 1

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

%S 3,21,152,1518,11499,98343,556989,3662106,16124119,85225430,312644461,

%T 1392323322,4440186675,17261781178,49427257741,171990299716,

%U 450949023627,1430808802178,3490735786071,10240050566337,23490703637555

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

%C Column 5 of A183413

%H R. H. Hardin, <a href="/A183412/b183412.txt">Table of n, a(n) for n = 1..32</a>

%e Some solutions for 4X5

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 04 2011

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Last modified April 23 23:26 EDT 2024. Contains 371917 sequences. (Running on oeis4.)