A202554 - OEIS

%I #5 Mar 31 2012 12:36:48

%S 3,8,17,37,73,151,293,598,1159,2358,4581,9314,18143,36880,72001,

%T 146325,286185,581427,1138813,2312865,4535493,9207989,18074789,

%U 36682275,72066977,146206411,287454709,582979035,1146938817,2325328271,4577459549

%N Number of nX2 0,1 arrays with the row and column sums nondecreasing

%C Column 2 of A202560

%H R. H. Hardin, <a href="/A202554/b202554.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=10

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

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

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

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

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 21 2011