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%I #4 Dec 18 2015 18:18:12
%S 3,42,3186,1299735,2860343784,34107691901433,2211749000480369037,
%T 782349734245964422491828
%N Number of n X n 0..2 matrices with row and column i=1..n having sum <= i*2
%C Column 2 of A213962
%e Some solutions for n=4
%e ..0..2..0..0....2..0..0..0....2..0..0..0....2..0..0..0....2..0..0..0
%e ..0..1..2..0....0..1..0..0....0..1..1..0....0..2..2..0....0..1..0..1
%e ..1..0..2..0....0..1..1..0....0..1..0..2....0..0..1..1....0..2..1..0
%e ..0..1..1..2....0..1..2..2....0..2..0..1....0..0..2..0....0..1..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Jun 28 2012
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