A201210 Number of nX2 0..3 arrays with every row and column running average nondecreasing rightwards and downwards

10, 50, 216, 867, 3318, 12314, 44858, 161257, 574237, 2029778, 7132780, 24943546, 86875164, 301535122, 1043529630, 3602228998, 12407419230, 42653320657, 146380696477, 501599529832, 1716499421419, 5866845453921, 20030578702565

Offset

1,1

Comments

Column 2 of A201216

Links

R. H. Hardin, Table of n, a(n) for n = 1..180

Example

Some solutions for n=7
..0..0....0..3....0..1....0..0....0..1....0..0....0..0....0..0....0..0....0..1
..0..1....0..3....0..1....1..2....0..1....1..2....0..2....0..2....0..0....0..1
..2..2....1..3....0..1....1..1....0..1....1..2....1..1....0..1....0..2....1..1
..2..2....3..3....0..1....1..3....0..2....1..3....1..2....2..2....3..3....2..3
..2..3....3..3....3..3....2..3....1..3....1..3....1..2....3..3....2..3....3..3
..2..3....2..3....2..2....1..3....2..2....1..3....1..2....2..2....1..3....3..3
..2..3....2..3....2..2....1..3....1..3....1..3....2..3....2..3....2..3....3..3

Crossrefs

Sequence in context: A086462 A201830 A192019 * A003207 A095687 A204272

Adjacent sequences: A201207 A201208 A201209 * A201211 A201212 A201213

Keyword

nonn

Author

R. H. Hardin Nov 28 2011

Status

approved