A186898 Number of (n+1) X 6 binary arrays with every 2 X 2 subblock determinant equal to exactly one or two horizontal and vertical neighbor 2 X 2 subblock determinants.

632, 1246, 3948, 14437, 39372, 158437, 554824, 2203303, 7843906, 30466049, 113590802, 441081353, 1649380080, 6378340507, 24111571374, 93224628427, 352830579988, 1361940600445, 5170282798940, 19947364408573, 75793555364736

Offset

1,1

Comments

Column 5 of A186902.

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 3 X 6
..1..0..0..1..0..0....0..0..0..1..0..1....1..0..1..1..0..0....0..0..1..1..0..0
..0..0..1..1..0..1....1..1..1..1..0..1....0..0..0..1..1..1....0..0..0..1..1..0
..0..1..1..0..0..0....1..1..1..0..0..1....0..1..1..1..0..0....1..1..1..1..0..0

Crossrefs

Cf. A186902.

Sequence in context: A139066 A345557 A345811 * A006913 A154088 A321639

Adjacent sequences: A186895 A186896 A186897 * A186899 A186900 A186901

Keyword

nonn

Author

R. H. Hardin, Feb 28 2011

Status

approved