A201231 Number of nX4 0..3 arrays with every row and column running average nondecreasing rightwards and downwards, and the number of instances of each value within one of each other

3, 24, 140, 1028, 7791, 66027, 508368, 4293464, 33177954, 282310785, 2226471492, 18845872240, 149352193586, 1252800269866, 9919439949887, 82782378005253, 656171911832714, 5446960364973500, 43213785216715427, 357463895275500826

Offset

1,1

Comments

Column 4 of A201235

Links

R. H. Hardin, Table of n, a(n) for n = 1..23

Example

Some solutions for n=6
..0..0..0..0....0..0..0..1....0..0..0..1....0..0..0..0....0..0..0..0
..0..1..2..1....0..1..1..1....0..0..0..2....0..1..1..1....0..0..3..1
..0..1..2..3....0..3..3..2....1..1..1..2....0..3..2..3....2..2..2..3
..1..1..3..2....0..3..2..2....1..3..2..3....1..3..2..2....1..2..3..2
..3..3..3..3....1..3..2..2....1..2..3..2....1..3..2..2....1..1..3..2
..1..2..2..2....1..3..2..3....2..3..3..3....1..3..2..3....1..1..3..3

Crossrefs

Sequence in context: A215636 A056350 A056344 * A212698 A226511 A125651

Adjacent sequences: A201228 A201229 A201230 * A201232 A201233 A201234

Keyword

nonn

Author

R. H. Hardin Nov 28 2011

Status

approved