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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 1
20, 181, 2234, 18564, 140884, 1052190, 7579137, 51585784, 331270888, 2024909124, 11885134942, 67329174131, 369027185265, 1959956349517, 10103702621330, 50645615019582, 247273236084923, 1177685989979054, 5478135751536604 (list; graph; refs; listen; history; text; internal format)
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: A091983 A037250 A000144 * A177073 A211153 A210429

Adjacent sequences:  A219578 A219579 A219580 * A219582 A219583 A219584

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 23 2012

STATUS

approved

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Last modified November 30 17:04 EST 2021. Contains 349424 sequences. (Running on oeis4.)