A187707 Number of 4X4 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

2, 72, 322, 1718, 2904, 9834, 13324, 31000, 49910, 84760, 98226, 211526, 234336, 325654, 454612, 691052, 742006, 1152832, 1224538, 1765938

Offset

1,1

Comments

Row 3 of A187705

Links

Table of n, a(n) for n=1..20.

Example

Some n=3 solutions for 4X4
..1..1..0..0....1..3..0..0....0..0..1..1....0..3..1..2....0..2..0..0
..2..2..2..2....1..3..2..3....1..1..1..1....0..1..1..2....0..2..1..3
..2..1..1..0....3..3..2..0....0..1..1..2....2..2..2..2....1..2..1..1
..0..0..2..0....0..0..2..0....0..1..0..0....0..0..1..1....1..2..2..2

Crossrefs

Sequence in context: A217842 A053318 A272757 * A163274 A030993 A283568

Adjacent sequences: A187704 A187705 A187706 * A187708 A187709 A187710

Keyword

nonn

Author

R. H. Hardin Mar 12 2011

Status

approved