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A222000 Number of n X n arrays with each row a permutation of 1..n having at least as many downsteps as the preceding row, with rows in lexicographically nonincreasing order 0
1, 2, 22, 2470, 16011558, 3982479033010, 167454529339944721318, 448166024141727075228729619483 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A222005

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A319620 A054349 A182293 * A261400 A113930 A181235

Adjacent sequences:  A221997 A221998 A221999 * A222001 A222002 A222003

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 03 2013

STATUS

approved

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Last modified April 17 11:50 EDT 2021. Contains 343064 sequences. (Running on oeis4.)