A203099 Number of nX6 0..3 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor

422, 1705124, 3790420430, 7574530822364, 15712898935252156, 32766523337754473494, 68145439667266350435686, 141695919109060311625392330, 294680177794961913094327501892

Offset

1,1

Comments

Column 6 of A203101

Links

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

Example

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

Crossrefs

Sequence in context: A248455 A238285 A231939 * A365865 A348099 A096024

Adjacent sequences: A203096 A203097 A203098 * A203100 A203101 A203102

Keyword

nonn

Author

R. H. Hardin Dec 29 2011

Status

approved