A202911 Number of nX3 0..7 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor

64, 31984, 9509536, 2397172032, 622483753816, 165216756703876, 43681585962838352, 11516921180669227688, 3038058234902923710566, 801695505848282515899812, 211540283503697058778299926

Offset

1,1

Comments

Column 3 of A202916

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A146517 A009497 A145258 * A013743 A223353 A098843

Adjacent sequences: A202908 A202909 A202910 * A202912 A202913 A202914

Keyword

nonn

Author

R. H. Hardin Dec 26 2011

Status

approved