A187701 Number of (n+1)X(n+1) 0..2 arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal

31, 1489, 72, 5030, 36, 7410, 474, 176936

Offset

1,1

Comments

Column 2 of A187705

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A057008 A159487 A130661 * A185512 A221444 A185665

Adjacent sequences: A187698 A187699 A187700 * A187702 A187703 A187704

Keyword

nonn

Author

R. H. Hardin Mar 12 2011

Status

approved