A187704 Number of (n+1)X(n+1) 0..5 arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal

170, 93476, 2904, 4225652, 12898

Offset

1,1

Comments

Column 5 of A187705

Links

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

Example

Some solutions for 4X4
..3..2..0..0....0..0..1..0....2..2..4..0....1..1..0..0....2..2..4..0
..3..2..2..4....3..2..1..0....5..5..5..0....1..1..2..4....2..2..2..0
..5..2..2..2....2..2..1..2....0..2..2..2....3..1..2..3....0..2..2..2
..0..0..2..2....4..4..1..2....0..5..0..0....0..0..2..3....0..4..2..2

Crossrefs

Sequence in context: A098244 A250957 A114048 * A263059 A243294 A015975

Adjacent sequences: A187701 A187702 A187703 * A187705 A187706 A187707

Keyword

nonn

Author

R. H. Hardin Mar 12 2011

Status

approved