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Number of nX2 0..3 arrays with row sums equal and column sums equal
1

%I #5 Mar 31 2012 12:36:50

%S 4,16,16,96,104,904,788,10448,6280,134716,51308,1853064,425884,

%T 26527440,3575216,389480016,30269864,5813357404,257993708,87736873196,

%U 2210701460,1334461492996,19026456248,20412201535352,164353672604,313578887333104

%N Number of nX2 0..3 arrays with row sums equal and column sums equal

%C Column 2 of A202686

%H R. H. Hardin, <a href="/A202680/b202680.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

%e ..3..1....1..3....1..1....2..2....2..2....2..0....2..0....0..0....0..2....1..1

%e ..1..3....3..1....2..0....1..3....2..2....0..2....1..1....0..0....2..0....1..1

%e ..2..2....2..2....0..2....3..1....2..2....1..1....0..2....0..0....1..1....1..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 22 2011