A187517 Number of (n+1)X(n+1) 0..2 arrays with the array of 2X2 subblock determinants antisymmetric and no off-diagonal 2X2 subblock determinant zero

31, 98, 354, 1780, 12008, 157694, 2808560, 115232300, 6691316378

Offset

1,1

Comments

Column 2 of A187521

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A142067 A081275 A139509 * A039463 A181188 A323617

Adjacent sequences: A187514 A187515 A187516 * A187518 A187519 A187520

Keyword

nonn

Author

R. H. Hardin Mar 10 2011

Status

approved