A186167 1/4 the number of nX8 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

97, 677283, 1610684397, 4840082975532, 13435825601048421, 38514280297010210802

Offset

1,1

Comments

Column 8 of A186168

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 3X8 with a(1,1)=0
..0..0..0..0..2..1..1..0....0..0..0..0..3..0..3..3....0..0..0..0..0..3..3..0
..0..1..1..2..2..3..1..0....0..1..1..0..3..0..0..3....0..1..1..2..2..1..0..0
..0..0..0..0..0..3..3..0....0..0..0..0..3..3..0..0....0..0..0..0..2..1..3..3

Crossrefs

Sequence in context: A193825 A338779 A209475 * A322606 A145309 A122128

Adjacent sequences: A186164 A186165 A186166 * A186168 A186169 A186170

Keyword

nonn

Author

R. H. Hardin Feb 13 2011

Status

approved