A219581 Number of 4Xn arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 4Xn array

20, 181, 2234, 18564, 140884, 1052190, 7579137, 51585784, 331270888, 2024909124, 11885134942, 67329174131, 369027185265, 1959956349517, 10103702621330, 50645615019582, 247273236084923, 1177685989979054, 5478135751536604

Offset

1,1

Comments

Row 4 of A219578

Links

R. H. Hardin, Table of n, a(n) for n = 1..110

Example

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

Crossrefs

Sequence in context: A361569 A000144 A361609 * A177073 A211153 A210429

Adjacent sequences: A219578 A219579 A219580 * A219582 A219583 A219584

Keyword

nonn

Author

R. H. Hardin Nov 23 2012

Status

approved