A201447 Number of nX4 0..3 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other

1, 9, 29, 112, 261, 846, 1720, 4193, 8065, 16693, 29073, 55954, 90874, 158301, 249828, 409302, 611841, 962288, 1392970, 2091478, 2957586, 4286258, 5893598, 8347259, 11221370, 15440747, 20464931, 27577548, 35834857, 47497364, 60856456, 79217039

Offset

1,2

Comments

Column 4 of A201451

Links

R. H. Hardin, Table of n, a(n) for n = 1..82

Example

Some solutions for n=10
..0..0..0..0....0..0..0..0....0..0..0..1....0..0..0..0....0..0..0..1
..0..0..0..1....0..1..1..1....0..0..1..1....0..0..0..0....0..0..1..1
..0..1..1..1....0..1..1..1....0..0..1..1....0..0..2..2....0..1..2..3
..0..1..2..2....0..1..1..1....0..0..1..1....1..1..2..2....0..1..2..3
..0..2..2..2....0..1..2..3....0..1..1..1....1..1..2..3....0..1..2..3
..1..2..2..3....0..2..2..3....2..2..3..3....1..1..2..3....0..1..2..3
..1..2..2..3....0..2..2..3....2..2..3..3....1..1..2..3....0..1..2..3
..1..2..3..3....2..2..2..3....2..2..3..3....1..1..2..3....1..1..2..3
..1..3..3..3....2..3..3..3....2..2..3..3....2..3..3..3....2..2..2..3
..1..3..3..3....2..3..3..3....2..2..3..3....2..3..3..3....2..3..3..3

Crossrefs

Sequence in context: A103535 A147268 A147376 * A288744 A183245 A101141

Adjacent sequences: A201444 A201445 A201446 * A201448 A201449 A201450

Keyword

nonn

Author

R. H. Hardin Dec 01 2011

Status

approved