|
%I #4 Mar 31 2012 12:36:09
%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
| 