A267408 Number of 7Xn arrays containing n copies of 0..7-1 with every element equal to or 1 greater than any north, west or northwest neighbors modulo 7 and the upper left element equal to 0.

1, 1, 1, 1, 1, 1, 2, 9, 222, 9469, 344458, 9785889, 224584539, 4264530811, 68776676697

Offset

1,7

Comments

Row 7 of A267401.

Links

Table of n, a(n) for n=1..15.

Example

Some solutions for n=8
..0..1..2..3..4..5..6..0....0..0..1..2..3..4..5..6....0..1..2..3..4..5..5..6
..1..1..2..3..4..5..6..0....0..1..1..2..3..4..5..6....0..1..2..3..4..5..6..6
..1..2..2..3..4..5..6..0....0..1..2..2..3..4..5..6....0..1..2..3..4..5..6..0
..1..2..3..3..4..5..6..0....0..1..2..3..3..4..5..6....1..1..2..3..4..5..6..0
..1..2..3..4..4..5..6..0....0..1..2..3..4..4..5..6....1..2..2..3..4..5..6..0
..1..2..3..4..5..5..6..0....0..1..2..3..4..5..5..6....1..2..3..3..4..5..6..0
..1..2..3..4..5..6..6..0....0..1..2..3..4..5..6..6....1..2..3..4..4..5..6..0

Crossrefs

Cf. A267401.

Sequence in context: A217017 A112311 A067564 * A359608 A165797 A011823

Adjacent sequences: A267405 A267406 A267407 * A267409 A267410 A267411

Keyword

nonn

Author

R. H. Hardin, Jan 13 2016

Status

approved