A187702 Number of (n+1) X (n+1) 0..3 arrays with each 2 X 2 subblock off diagonal and antidiagonal nonsingular and the array of 2 X 2 subblock determinants antisymmetric about the diagonal and antidiagonal.

64, 8272, 322, 81456, 530, 230446

Offset

1,1

Comments

Column 3 of A187705.

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 4 X 4
..0..0..3..0....0..0..2..0....2..1..0..0....0..0..1..1....0..2..0..0
..2..1..1..0....2..3..2..0....2..1..1..1....3..3..3..3....0..1..1..2
..3..3..3..3....0..3..2..3....3..1..1..0....0..1..1..2....2..1..1..0
..2..2..1..1....0..3..0..0....0..0..1..0....0..3..0..0....0..0..2..0

Crossrefs

Cf. A187705.

Sequence in context: A317516 A300181 A183499 * A184764 A239647 A222140

Adjacent sequences: A187699 A187700 A187701 * A187703 A187704 A187705

Keyword

nonn

Author

R. H. Hardin Mar 12 2011

Status

approved