A267659 Number of 7Xn arrays containing n copies of 0..7-1 with every element equal to or 1 greater than any north or southwest neighbors modulo 7 and the upper left element equal to 0.

1, 3, 17, 203, 7672, 201362, 3562990, 52241496, 855234512, 19809675462

Offset

1,2

Comments

Row 7 of A267655.

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=5
..0..2..3..4..5....0..1..2..4..5....0..2..3..4..5....0..2..3..4..5
..1..2..4..5..6....0..2..3..4..5....1..2..3..5..6....1..2..4..5..6
..2..3..5..6..0....1..2..3..5..6....2..2..4..6..0....2..3..4..6..0
..2..4..5..6..0....2..3..4..6..0....2..3..5..6..0....2..3..5..6..1
..3..4..6..0..1....3..4..5..0..1....3..4..5..6..1....3..4..6..0..1
..3..5..0..1..2....3..5..6..0..1....3..4..6..0..1....3..5..6..0..1
..4..6..1..1..3....4..6..6..1..2....4..5..0..1..1....4..5..0..1..2

Crossrefs

Cf. A267655.

Sequence in context: A133991 A210898 A009494 * A075271 A194925 A072350

Adjacent sequences: A267656 A267657 A267658 * A267660 A267661 A267662

Keyword

nonn

Author

R. H. Hardin, Jan 19 2016

Status

approved