A187629 Number of (n+1)X(n+1) 0..1 arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular

10, 24, 24, 954, 954, 194008, 194008, 196196792, 196196792, 1031851558448, 1031851558448, 27419179198175312, 27419179198175312

Offset

1,1

Comments

Column 1 of A187633

Links

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

Example

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

Crossrefs

Sequence in context: A250797 A250583 A223415 * A175403 A133503 A175425

Adjacent sequences: A187626 A187627 A187628 * A187630 A187631 A187632

Keyword

nonn

Author

R. H. Hardin Mar 12 2011

Status

approved