A214008 - OEIS

%I #4 Dec 18 2015 18:18:12

%S 5,375,564041,17609835599,11798463876314995

%N Number of n X n nonnegative integer matrices with row and column i=1..n having sum <= i*4

%C Column 4 of A214011

%e Some solutions for n=3

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

%e ..0..6..2....0..2..0....4..1..0....0..0..4....0..5..0....0..8..0....0..4..3

%e ..0..0..7....0..2..9....0..0..4....0..0..5....0..2..0....0..0..2....0..2..6

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 30 2012