A187621 Number of (n+1)X(n+1) 0..1 arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation

10, 24, 2, 948, 36, 190972, 3020, 194618700, 929380, 1018751442652, 1744283776, 27189851221308572, 15262275217840

Offset

1,1

Comments

Column 1 of A187624

Links

Table of n, a(n) for n=1..13.

Example

All solutions for 4X4
..1..1..0..1....1..0..1..1
..0..1..1..1....1..1..1..0
..1..1..1..0....0..1..1..1
..1..0..1..1....1..1..0..1

Crossrefs

Sequence in context: A250188 A177126 A300150 * A231880 A102089 A250797

Adjacent sequences: A187618 A187619 A187620 * A187622 A187623 A187624

Keyword

nonn

Author

R. H. Hardin Mar 12 2011

Status

approved