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A219574
Number of n X 4 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 n X 4 array.
1
20, 132, 1866, 18564, 154271, 1230906, 9838834, 77121132, 574114068, 4011221077, 26423019415, 165621299493, 995370542165, 5764471362464, 32276996597715, 175191988301623, 923800070721626, 4741175946914574, 23718827918983202, 115807012054133424, 552411871489072567
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=3:
..2..0..0..0....1..1..0..0....1..0..0..0....1..0..0..0....1..1..0..0
..1..1..0..0....2..1..1..0....2..1..0..0....1..1..0..0....3..1..1..0
..1..1..1..3....3..1..1..1....2..2..3..2....3..1..2..1....3..2..0..0
CROSSREFS
Column 4 of A219578.
Sequence in context: A006417 A156392 A374709 * A356272 A188145 A168178
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 23 2012
STATUS
approved