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%I #4 Dec 18 2015 18:18:12
%S 4,120,32060,74323976,1494988224948,261421322089741976,
%T 398278555474658144086480,5298226825488439815883527067288
%N Number of n X n 0..3 matrices with row and column i=1..n having sum <= i*3
%C Column 3 of A213962
%e Some solutions for n=4
%e ..0..0..1..2....1..0..0..0....3..0..0..0....3..0..0..0....3..0..0..0
%e ..0..3..3..0....0..3..1..2....0..1..1..1....0..3..3..0....0..2..2..0
%e ..1..0..1..2....1..0..1..3....0..1..2..3....0..1..3..3....0..3..1..3
%e ..1..1..0..0....1..3..3..1....0..1..2..0....0..1..1..1....0..0..3..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Jun 28 2012
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