A206691 Number of nX7 0..3 arrays with no element equal to another within two positions in the same row or column, and new values 0..3 introduced in row major order.

16, 1216, 11264, 127008, 1454810, 17277556, 208563912, 2543024548, 31198656992, 384076975680, 4737250216482, 58497114248288, 722787914355820, 8933909144447138, 110448738176212632, 1365616810440861728

Offset: 1

Author

R. H. Hardin Feb 11 2012

Keywords

• nonn

Comments

Column 7 of A206692

Examples

			Some solutions for n=4
..0..1..2..3..0..1..2....0..1..2..3..1..0..2....0..1..2..3..0..2..3
..1..3..0..1..2..3..0....1..3..0..1..2..3..0....1..2..3..0..1..3..0
..2..0..1..2..3..0..1....2..0..3..2..0..1..3....2..3..1..2..3..0..1
..0..2..3..0..1..2..3....3..2..1..0..3..2..1....3..1..0..3..2..1..3
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210