A187626 Number of 4X4 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation

2, 60, 390, 2146, 5324, 16042, 28916, 71012, 121678, 216768, 302470, 606282, 785548

Offset

1,1

Comments

Row 3 of A187624

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Sequence in context: A275819 A048541 A067739 * A059934 A006333 A001760

Adjacent sequences: A187623 A187624 A187625 * A187627 A187628 A187629

Keyword

nonn

Author

R. H. Hardin Mar 12 2011

Status

approved