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%I #6 Aug 12 2016 06:54:16
%S 1,4,5,15,21,57,85,220,341,858,1365,3368,5461,13276,21845,52479,87381,
%T 207861,349525,824527,1398101,3274395,5592405,13015081,22369621,
%U 51769813,89478485,206045841,357913941,820475513,1431655765,3268499356,5726623061
%N Number of 2Xn arrays containing n copies of 0..2-1 with row sums and column sums nondecreasing.
%C Row 2 of A267990.
%H R. H. Hardin, <a href="/A267991/b267991.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=8
%e ..0..0..0..0..1..0..1..1....0..0..0..1..1..0..0..0....1..0..1..0..1..1..0..0
%e ..0..0..1..1..0..1..1..1....1..1..1..0..0..1..1..1....0..1..0..1..0..0..1..1
%Y Cf. A267990.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 23 2016
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