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A221629 Number of 7Xn arrays with each row a permutation of 1..n having at least as many downsteps as the preceding row 1
1, 8, 29124, 183919920, 15258126049410, 2638115823321645192, 2031241364747667201263520, 3210318128660193294063849550080, 13896214616394139128043246845049514250 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 7 of A221623

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..12

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A281359 A067070 A115478 * A013788 A156178 A256423

Adjacent sequences:  A221626 A221627 A221628 * A221630 A221631 A221632

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 21 2013

STATUS

approved

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Last modified March 25 22:28 EDT 2019. Contains 321477 sequences. (Running on oeis4.)