A230178 Number of n X n 0..2 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value 2-x(i,j)

0, 9, 231, 73857, 133265847, 1576417829097, 117863748242661711, 56231441027001164749647, 170772883022204028026156020737, 3303166614870365380110300414534929643

Offset

1,2

Comments

Diagonal of A230184

Links

R. H. Hardin, Table of n, a(n) for n = 1..11

Example

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

Crossrefs

Sequence in context: A247019 A181205 A152101 * A165389 A153223 A276536

Adjacent sequences: A230175 A230176 A230177 * A230179 A230180 A230181

Keyword

nonn

Author

R. H. Hardin, Oct 11 2013

Status

approved