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Number of 2Xn 0..1 arrays with row sums nondecreasing and column sums unimodal
1

%I #4 Mar 24 2013 10:29:00

%S 3,11,35,98,260,643,1563,3631,8407,18833,42313,92621,203973,439525,

%T 954373,2033480,4369630,9232317,19680561,41311764,87507822,182738699,

%U 385095795,800788788,1680371358,3482028637,7280492521,15041978366

%N Number of 2Xn 0..1 arrays with row sums nondecreasing and column sums unimodal

%C Row 2 of A223625

%H R. H. Hardin, <a href="/A223626/b223626.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 24 2013