A187524 Number of 5 X 5 0..n arrays with the array of 2 X 2 subblock determinants antisymmetric and no off-diagonal 2 X 2 subblock determinant zero.

0, 1780, 73764, 1655170, 8174314, 70304076, 193687886

Offset

1,2

Comments

Row 4 of A187521.

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for 5 X 5
..1..2..2..2..2....0..0..2..1..2....2..2..1..0..1....0..0..3..0..2
..1..2..1..2..1....2..2..2..3..0....1..1..1..2..3....2..1..1..2..0
..0..2..1..1..0....0..2..2..1..2....2..1..1..1..2....3..3..3..3..1
..1..1..1..1..1....2..0..2..1..1....2..0..1..1..1....2..0..1..1..0
..0..2..3..2..2....2..3..3..2..2....2..1..2..3..3....3..2..1..2..0

Crossrefs

Cf. A187521.

Sequence in context: A282404 A167282 A237906 * A253057 A204637 A023088

Adjacent sequences: A187521 A187522 A187523 * A187525 A187526 A187527

Keyword

nonn

Author

R. H. Hardin, Mar 10 2011

Status

approved