A198657 Number of nX3 0..7 arrays with values 0..7 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.

1, 14, 185, 3904, 98467, 3053286, 109133049, 4460603630, 202661109307, 10057569576034, 533251017131222, 29684104738808241, 1708995821028336330, 100671800330158890680, 6020806089426293935506, 363687165160204642974491

Offset: 1

Author

R. H. Hardin Oct 28 2011

Keywords

• nonn

Comments

Column 3 of A198661

Examples

			Some solutions with all values 0 to 7 for n=6
..0..0..1....0..1..1....0..1..1....0..1..2....0..0..1....0..1..1....0..1..1
..2..2..1....0..2..2....0..0..2....0..1..2....2..2..1....0..2..3....0..2..2
..3..4..5....3..3..4....3..3..2....3..3..4....3..3..4....0..2..3....3..3..2
..3..4..5....5..3..4....4..5..6....5..5..4....5..5..4....4..5..5....4..4..5
..6..6..0....5..6..7....4..5..6....6..6..6....6..6..4....4..6..6....6..5..5
..7..7..0....6..6..7....4..7..7....7..7..6....7..7..7....7..7..6....6..7..7
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..138