# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a187700 Showing 1-1 of 1 %I A187700 #4 Mar 31 2012 12:36:09 %S A187700 104,7954,87258,692410,2363474,10839282,23999702,69386216,148926738 %N A187700 Number of 4X4 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection %C A187700 Row 3 of A187699 %e A187700 Some n=3 solutions for 4X4 %e A187700 ..0..2..0..2....0..3..0..3....2..1..2..1....0..1..0..1....0..1..3..2 %e A187700 ..3..1..3..0....1..0..1..3....2..3..2..3....1..3..1..3....2..0..1..0 %e A187700 ..0..2..0..2....0..1..0..1....3..1..3..1....1..2..1..2....0..1..0..2 %e A187700 ..3..2..3..0....3..0..3..2....2..2..2..2....1..1..1..1....2..2..1..2 %K A187700 nonn %O A187700 1,1 %A A187700 _R. H. Hardin_ Mar 12 2011 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE