A198905 Number of nX7 0..4 arrays with values 0..4 introduced in row major order and no element equal to any horizontal or vertical neighbor.

187, 804833, 3794115705, 17895005957823, 84402688527136201, 398089706066811447174, 1877611081501313948217870, 8855851690895754550489882369, 41769091588504560613470987916898

Offset: 1

Author

R. H. Hardin Oct 31 2011

Keywords

• nonn

Comments

Column 7 of A198906

Examples

			Some solutions with values 0 to 4 for n=4
..0..1..0..1..0..2..3....0..1..0..1..0..2..0....0..1..0..1..0..2..1
..1..0..1..0..1..3..2....1..0..1..0..3..0..2....1..0..1..0..3..4..3
..0..1..0..2..0..2..3....0..1..0..2..4..2..4....0..1..0..2..0..1..0
..1..0..2..0..2..4..1....1..0..2..0..2..1..3....1..0..2..0..2..0..2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..27