A185765 Number of (n+1)X6 binary arrays with no 2X2 subblock trace equal to any horizontal or vertical neighbor 2X2 subblock trace

680, 3456, 19992, 118248, 725352, 4430912, 27172072, 166155112, 1017804600, 6228062600, 38135220896, 233413737792, 1428998627808, 8747287514112, 53549280280392, 327801163275208, 2006695538548152, 12284116597745992

Offset

1,1

Comments

Column 5 of A185769

Links

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

Formula

Empirical: a(n)=a(n-1)+30*a(n-2)+24*a(n-3)-95*a(n-4)-15*a(n-5)+64*a(n-6)-116*a(n-7)+16*a(n-8)+16*a(n-9) for n>12

Example

Some solutions for 3X6
..1..0..1..1..0..0....0..1..1..0..1..0....1..0..1..0..1..0....0..0..0..0..0..0
..0..1..0..1..0..0....1..1..1..0..0..1....0..1..0..1..1..1....0..0..1..0..1..0
..0..0..0..0..1..1....0..1..0..1..1..0....0..0..1..1..1..0....1..1..0..0..0..1

Crossrefs

Sequence in context: A253702 A235013 A154036 * A206015 A202908 A309245

Adjacent sequences: A185762 A185763 A185764 * A185766 A185767 A185768

Keyword

nonn

Author

R. H. Hardin Feb 03 2011

Status

approved