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A221626 Number of 4Xn arrays with each row a permutation of 1..n having at least as many downsteps as the preceding row 1
1, 5, 453, 85035, 51149685, 57614883627, 130516916069715, 492362067027383802, 3063154239917651379537, 28932140956374841410316707, 405028623674958829496315433651, 8040080740216333451541433497055002 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221623

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..13

EXAMPLE

Some solutions for n=3

..2..3..1....1..3..2....1..2..3....2..3..1....2..1..3....1..2..3....2..3..1

..2..3..1....2..1..3....1..2..3....1..3..2....3..1..2....1..2..3....2..3..1

..2..3..1....2..3..1....3..1..2....2..1..3....3..1..2....1..3..2....3..1..2

..1..3..2....2..3..1....2..1..3....3..1..2....2..3..1....2..1..3....1..3..2

CROSSREFS

Sequence in context: A055305 A300971 A300928 * A332145 A144509 A240700

Adjacent sequences:  A221623 A221624 A221625 * A221627 A221628 A221629

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 21 2013

STATUS

approved

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Last modified September 22 13:48 EDT 2021. Contains 347607 sequences. (Running on oeis4.)