A267429 Number of 7 X n arrays containing n copies of 0..7-1 with every element equal to or 1 greater than any west, northeast or northwest neighbors modulo 7 and the upper left element equal to 0.

720, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 34, 701, 19074, 522450, 11762912, 217691742, 3402077276

Offset

1,1

Links

Table of n, a(n) for n=1..20.

Example

A solution for n=15:
..0..0..1..1..2..2..2..3..3..4..4..5..5..6..6
..0..1..1..2..2..2..3..3..4..4..5..5..6..6..0
..1..1..2..2..3..3..3..4..4..5..5..6..6..0..0
..2..2..2..3..3..4..4..4..5..5..6..6..0..0..1
..2..2..3..3..4..4..5..5..5..6..6..0..0..1..1
..2..3..3..4..4..5..5..6..6..6..0..0..1..1..1
..3..3..4..4..5..5..6..6..0..0..0..1..1..1..2

Crossrefs

Row 7 of A267425.

Sequence in context: A269124 A267336 A167984 * A317660 A267571 A267287

Adjacent sequences: A267426 A267427 A267428 * A267430 A267431 A267432

Keyword

nonn,more

Author

R. H. Hardin, Jan 14 2016

Status

approved