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

1,1

Comments

Column 7 of A206692

Links

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

Example

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

Crossrefs

Sequence in context: A102807 A373453 A160131 * A064346 A222888 A113104

Adjacent sequences: A206688 A206689 A206690 * A206692 A206693 A206694

Keyword

nonn

Author

R. H. Hardin, Feb 11 2012

Status

approved