A232949 Number of n X n 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, and top left element zero.

1, 21, 1881, 685251, 1074244299, 7168373617095, 205030957086979647, 25121788915317351455997, 13201474923932116066095060171, 29758989052767328125373420316820645

Offset: 1

Author

R. H. Hardin, Dec 02 2013

Keywords

• nonn

Comments

Diagonal of A232955

Examples

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

Links

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