A203440 Number of nX5 0..7 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 2528, 4401184, 3216740482, 1842430382222, 1163067191357930, 781112517644514067, 520944312459613615031, 344915375300852781639149, 229146836391481660904752370, 152707095706138036937766893448

Offset

1,2

Comments

Column 5 of A203443

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A252288 A268332 A369521 * A231968 A172142 A206596

Adjacent sequences: A203437 A203438 A203439 * A203441 A203442 A203443

Keyword

nonn

Author

R. H. Hardin Jan 01 2012

Status

approved