A208871 Number of nX7 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors

715, 4578580, 32271626438, 228847686794351, 1624001903270517563, 11525604443642285224422, 81798476241280856702695038, 580533377647449287012352167379, 4120113916814898485216382089787455

Offset

1,1

Comments

Column 7 of A208872

Links

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

Example

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

Crossrefs

Sequence in context: A208352 A223061 A208863 * A208878 A208174 A200800

Adjacent sequences: A208868 A208869 A208870 * A208872 A208873 A208874

Keyword

nonn

Author

R. H. Hardin Mar 02 2012

Status

approved