A203345 Number of nX7 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 12487, 48091042, 72606563663, 112737045408576, 202012748290560363

Offset

1,2

Comments

Column 7 of A203346

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A272132 A206664 A033669 * A232104 A122726 A072891

Adjacent sequences: A203342 A203343 A203344 * A203346 A203347 A203348

Keyword

nonn

Author

R. H. Hardin Dec 31 2011

Status

approved