A185832 Half the number of nX6 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

5, 162, 1430, 11789, 98975, 923808, 7678409, 68363184, 593948668, 5187350050, 45205777641, 395015488029, 3443605978936, 30060887575003, 262260968830996, 2288567378102476, 19968587237909055, 174246131512755338

Offset

1,1

Comments

Column 6 of A185835

Links

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

Example

Some solutions for 4X6 with a(1,1)=0
..0..1..1..1..1..1....0..0..1..1..1..0....0..0..0..1..1..0....0..0..0..1..1..1
..0..0..0..0..0..1....0..1..0..0..1..0....0..1..1..1..0..0....0..1..1..0..0..0
..1..1..1..1..1..1....0..1..0..0..1..0....0..1..0..0..1..1....1..0..1..0..1..0
..0..0..0..0..0..0....0..0..1..1..0..0....0..1..1..0..0..1....1..0..1..0..1..0

Crossrefs

Sequence in context: A322747 A274712 A117068 * A301667 A195950 A195951

Adjacent sequences: A185829 A185830 A185831 * A185833 A185834 A185835

Keyword

nonn

Author

R. H. Hardin Feb 05 2011

Status

approved