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A203558 Number of nX2 0..2 arrays with row sums equal and column sums equal 1

%I

%S 3,9,9,33,53,183,395,1249,3141,9459,25655,75639,212943,623093,1787609,

%T 5222369,15134933,44250051,128996855,377748883,1105350731,3242546393,

%U 9513228125,27953744695,82176836303,241834027353,712070156205

%N Number of nX2 0..2 arrays with row sums equal and column sums equal

%C Column 2 of A203564

%H R. H. Hardin, <a href="/A203558/b203558.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

%e ..1..1....2..2....2..0....2..2....0..0....1..1....1..1....2..0....0..0....2..2

%e ..1..1....2..2....1..1....2..2....0..0....0..2....0..2....1..1....0..0....2..2

%e ..2..0....2..2....1..1....2..2....0..0....2..0....2..0....2..0....0..0....2..2

%e ..1..1....2..2....1..1....2..2....0..0....2..0....0..2....0..2....0..0....2..2

%e ..0..2....2..2....0..2....2..2....0..0....0..2....2..0....0..2....0..0....2..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 03 2012

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Last modified September 25 15:27 EDT 2021. Contains 347658 sequences. (Running on oeis4.)