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A187627 Number of 5X5 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation 0

%I

%S 948,324452,12278892,221177664,1896404966

%N Number of 5X5 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation

%C Row 4 of A187624

%e Some n=3 solutions for 5X5

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 12 2011

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Last modified October 16 13:48 EDT 2021. Contains 348042 sequences. (Running on oeis4.)