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 A184649 T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with each 3X3 subblock having a positive determinant 4

%I #5 Mar 31 2012 12:36:00

%S 106449,3745509,3745509,127914873,398829619,127914873,4349714604,

%T 40374310135,40374310135,4349714604,148865535558,3941878848972,

%U 11808364027889,3941878848972,148865535558,5086456344189,398138249828378

%N T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with each 3X3 subblock having a positive determinant

%C Table starts

%C ........106449.........3745509........127914873.......4349714604

%C .......3745509.......398829619......40374310135....3941878848972

%C .....127914873.....40374310135...11808364027889.3298741433422598

%C ....4349714604...3941878848972.3298741433422598

%C ..148865535558.398138249828378

%C .5086456344189

%H R. H. Hardin, <a href="/A184649/b184649.txt">Table of n, a(n) for n = 1..24</a>

%e Some solutions for 5X4

%e ..0..0..2..0....0..0..2..0....0..0..2..0....0..0..2..0....0..0..2..0

%e ..1..0..0..1....1..0..0..1....1..0..0..1....1..0..0..1....1..0..0..1

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

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

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

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_ Jan 18 2011

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Last modified May 27 23:25 EDT 2023. Contains 362992 sequences. (Running on oeis4.)