A267287 Number of 7Xn arrays containing n copies of 0..7-1 with every element equal to or 1 greater than any southwest or northwest neighbors modulo 7 and the upper left element equal to 0.

720, 4, 4, 40, 8724, 315356, 4893787, 55479601, 912215513

Offset

1,1

Comments

Row 7 of A267278.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A267278.

Sequence in context: A267429 A317660 A267571 * A267746 A267026 A145226

Adjacent sequences: A267284 A267285 A267286 * A267288 A267289 A267290

Keyword

nonn

Author

R. H. Hardin, Jan 12 2016

Status

approved