%I #16 Mar 31 2012 12:36:01
%S 132,7854,116520,916860,4820439,19624035,65713455,190759077,493962822,
%T 1168477251,2559841278,5270707320,10278584778,19140242421,34233601737,
%U 59117179833,98911520802,160982370882,255478326648,396430119123
%N Number of 3X3 1..n+1 arrays with positive determinant
%H R. H. Hardin, <a href="/A184893/b184893.txt">Table of n, a(n) for n = 1..39</a>
%e Some positive determinant 3X3 1..2 matrices
%e ..2..2..2....2..2..1....2..2..1....2..2..1....1..1..2....2..1..2....2..2..2
%e ..2..1..1....2..1..2....1..2..1....1..2..1....2..1..1....2..1..1....2..2..1
%e ..2..2..1....2..1..1....2..1..2....2..2..2....1..1..1....1..2..1....1..2..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 02 2011