A203388 Number of nX7 0..6 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 86156, 1678700434, 10639041328647, 61265314914283103

Offset

1,2

Comments

Column 7 of A203389

Links

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

Example

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

Crossrefs

Sequence in context: A234805 A186065 A238309 * A206657 A231322 A237783

Adjacent sequences: A203385 A203386 A203387 * A203389 A203390 A203391

Keyword

nonn

Author

R. H. Hardin Jan 01 2012

Status

approved