A187635 Number of 5X5 0..n arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular

954, 557382, 31903442, 686589106, 7836968262

Offset

1,1

Comments

Row 4 of A187633

Links

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

Example

Some n=3 solutions for 5X5
..2..0..2..1..2....2..0..2..1..2....2..0..2..3..2....2..0..2..0..2
..0..1..0..1..0....0..3..0..3..0....0..2..0..2..0....0..2..2..2..2
..1..2..3..1..1....3..0..2..0..3....2..2..1..1..2....3..0..1..0..3
..0..1..0..1..0....0..3..1..3..1....0..2..0..2..0....0..2..0..2..2
..2..1..2..0..2....2..3..3..3..3....2..0..2..3..2....2..0..2..1..3

Crossrefs

Sequence in context: A203024 A055161 A055158 * A345524 A345778 A076528

Adjacent sequences: A187632 A187633 A187634 * A187636 A187637 A187638

Keyword

nonn

Author

R. H. Hardin Mar 12 2011

Status

approved