A230681 Number of 7Xn 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j)

0, 63291, 53519163, 42681522741, 47444197636239, 51564141085334199, 55314799986833459367, 59453762981075686349985, 63928300225239002685024369

Offset

1,2

Comments

Row 7 of A230675

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A234080 A232264 A209713 * A209793 A115748 A226003

Adjacent sequences: A230678 A230679 A230680 * A230682 A230683 A230684

Keyword

nonn

Author

R. H. Hardin, Oct 27 2013

Status

approved