A203441 Number of nX6 0..7 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 21988, 168492336, 482229769194, 1163067191357930

Offset

1,2

Comments

Column 6 of A203443

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for n=5
..6..6..4..2..5..5....4..4..1..2..2..0....7..7..6..6..5..1....2..6..7..7..4..0
..6..6..7..7..5..5....4..4..0..7..7..1....7..7..0..6..5..4....2..6..7..7..4..0
..6..0..7..7..1..4....2..0..3..7..7..4....0..1..3..6..3..4....2..6..4..3..4..0
..6..3..5..7..7..4....4..4..3..6..7..7....4..4..6..6..6..4....4..6..6..7..7..4
..6..6..6..7..7..2....4..4..0..2..7..7....4..4..6..6..6..0....4..4..4..7..7..4

Crossrefs

Sequence in context: A250569 A109689 A209733 * A217533 A045133 A049535

Adjacent sequences: A203438 A203439 A203440 * A203442 A203443 A203444

Keyword

nonn

Author

R. H. Hardin Jan 01 2012

Status

approved