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%I #4 Dec 18 2015 18:18:12
%S 7,1372,9976732,2747459653062,29476753771054668510
%N Number of n X n nonnegative integer matrices with row and column i=1..n having sum <= i*6
%C Column 6 of A214011
%e Some solutions for n=3
%e ..0..4..0....0..3..0....0..0..0....0..3..0....0..1..0....0..1..4....3..0..0
%e ..0..0..0....3..3..0....2..3..4....0..0..7....2..0..0....6..0..0....0..9..0
%e ..4..0..0....0..5..4....0..1..0....0..0.10....0..1..1....0..5..5....0..0..5
%K nonn
%O 1,1
%A _R. H. Hardin_ Jun 30 2012
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