A199643 Number of nX4 0..2 arrays with values 0..2 introduced in row major order and each element equal to one or two horizontal and vertical neighbors

2, 60, 1265, 29229, 658770, 15066222, 342328663, 7797114144, 177447181083, 4039488090307, 91947444344704, 2092999963213610, 47642308975551650, 1084472533833020100, 24685590900071146822, 561912613968766782369

Offset

1,1

Comments

Column 4 of A199647

Links

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

Example

Some solutions for n=3
..0..1..1..2....0..1..1..0....0..0..0..0....0..0..1..1....0..0..0..1
..0..1..1..2....0..1..2..0....0..1..1..1....2..2..2..1....1..2..2..1
..2..2..2..2....0..0..2..2....2..2..2..2....2..1..1..1....1..1..1..1

Crossrefs

Sequence in context: A272980 A222652 A227624 * A056923 A173221 A082787

Adjacent sequences: A199640 A199641 A199642 * A199644 A199645 A199646

Keyword

nonn

Author

R. H. Hardin Nov 08 2011

Status

approved