A186054 Number of (n+2)X(n+2) binary arrays with each 3X3 subblock having a positive determinant

87, 1217, 26868, 836891, 58408337, 6541274560, 1130708781343, 404252413909581, 239686988190497117, 224842795740772389253, 420525789504469841741415

Offset

1,1

Comments

Diagonal of A186063

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A294907 A093287 A231218 * A082955 A201154 A171344

Adjacent sequences: A186051 A186052 A186053 * A186055 A186056 A186057

Keyword

nonn

Author

R. H. Hardin Feb 11 2011

Status

approved