A227746 Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having determinant equal to one

2, 13, 210, 10092, 1378923, 536234494, 593219255593, 1866485946679255, 16707964949615383863, 425495289603079437453771, 30826893520750966059187346452

Offset

1,1

Comments

Diagonal of A227751

Links

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

Example

Some solutions for n=4
..1..0..0..1....1..0..0..1....1..0..1..0....0..1..0..1....0..0..1..0
..0..0..0..1....0..0..0..0....0..0..0..0....0..0..1..0....1..0..1..0
..1..0..0..0....0..0..0..0....1..0..1..0....0..0..1..0....1..1..0..1
..1..1..0..1....0..0..1..0....0..1..0..1....0..1..0..0....0..0..0..0

Crossrefs

Sequence in context: A367830 A102585 A367828 * A078702 A381985 A259795

Adjacent sequences: A227743 A227744 A227745 * A227747 A227748 A227749

Keyword

nonn

Author

R. H. Hardin Jul 25 2013

Status

approved