A187623 Number of (n+1)X(n+1) 0..3 arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation

64, 2924, 390, 12278892, 4232368

Offset

1,1

Comments

Column 3 of A187624

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for 4X4
..1..0..2..3....1..1..0..1....1..3..2..3....2..1..0..2....1..2..1..2
..3..1..1..1....0..1..1..1....0..1..1..1....0..1..1..2....0..1..1..1
..1..1..1..3....1..1..1..0....1..1..1..0....1..1..1..1....1..1..1..0
..3..2..0..1....2..1..2..1....3..2..3..1....2..0..1..3....2..1..2..1

Crossrefs

Sequence in context: A283696 A283128 A295714 * A187631 A221831 A282397

Adjacent sequences: A187620 A187621 A187622 * A187624 A187625 A187626

Keyword

nonn

Author

R. H. Hardin Mar 12 2011

Status

approved