A232934 Number of n X n 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, vertically or antidiagonally.

3, 12, 84, 1048, 26644, 1294504, 123516664, 22870954236, 8259047739212, 5804528923256596, 7946219601520287416, 21181791025549725373140, 109959477313325884615593152, 1111595819289260873354274996460

Offset

1,1

Comments

Diagonal of A232941.

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

Some solutions for n=5
..0..0..0..0..1....1..2..2..2..2....2..2..2..2..1....0..1..0..0..0
..0..1..0..0..0....2..2..2..2..2....1..2..2..2..2....0..0..0..0..0
..0..0..1..0..0....2..1..2..2..2....2..2..2..2..2....1..0..1..0..0
..0..0..0..0..1....2..2..1..2..2....1..2..2..2..2....0..0..0..0..0
..1..0..0..0..0....2..2..2..1..2....2..1..2..1..2....1..0..1..0..0

Crossrefs

Cf. A232941.

Sequence in context: A225905 A355322 A070825 * A077047 A074505 A260912

Adjacent sequences: A232931 A232932 A232933 * A232935 A232936 A232937

Keyword

nonn

Author

R. H. Hardin, Dec 02 2013

Status

approved