A185525 Number of (n+2)X(n+2) binary arrays with each 3X3 subblock nonsingular

174, 4362, 215644, 19941490, 3749400138, 1376360631638, 981555541329694, 1383146517309461758

Offset

1,1

Comments

Diagonal of A185534

Links

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

Example

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

Crossrefs

Sequence in context: A185526 A248458 A053173 * A224433 A213866 A252717

Adjacent sequences: A185522 A185523 A185524 * A185526 A185527 A185528

Keyword

nonn

Author

R. H. Hardin Jan 30 2011

Status

approved