A187708 Number of 5X5 0..n arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal

34, 5030, 81456, 875696, 4225652, 22532156, 67940472, 225606354, 577091334, 1469652502

Offset

1,1

Comments

Row 4 of A187705

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A297072 A232900 A209943 * A231084 A291976 A212035

Adjacent sequences: A187705 A187706 A187707 * A187709 A187710 A187711

Keyword

nonn

Author

R. H. Hardin Mar 12 2011

Status

approved