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A184893 Number of 3X3 1..n+1 arrays with positive determinant 1

%I

%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

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Last modified April 11 18:00 EDT 2021. Contains 342888 sequences. (Running on oeis4.)