A203439 Number of n X 4 0..7 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.

1, 372, 142108, 24278164, 3216740482, 482229769194, 79772073060022, 13081859298444294, 2103850173825539982, 338559840680298187294, 54816869874330915574505, 8891041335795074855285935

Offset

1,2

Comments

Column 4 of A203443.

Links

R. H. Hardin, Table of n, a(n) for n = 1..98

Example

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

Crossrefs

Cf. A203443.

Sequence in context: A265659 A238774 A299832 * A265235 A202912 A297383

Adjacent sequences: A203436 A203437 A203438 * A203440 A203441 A203442

Keyword

nonn

Author

R. H. Hardin, Jan 01 2012

Status

approved