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A212944 Number of 2Xn 0..n-1 arrays with no column j greater than or equal to than column j-1 in all rows 1
1, 7, 181, 10311, 1016501, 152747323, 32383630189, 9192184928839, 3362887443335365, 1540205755192368507, 863047803911184565037, 580733337119861320815291, 462049013032247252827284109 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 2 of A212943

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..19

EXAMPLE

Some solutions for n=4

..1..1..2..2....1..0..3..3....3..3..0..3....0..1..0..1....0..0..1..3

..3..2..1..0....1..3..2..0....1..0..2..0....3..2..3..1....3..2..1..0

CROSSREFS

Sequence in context: A226550 A141983 A080484 * A068339 A219404 A202026

Adjacent sequences:  A212941 A212942 A212943 * A212945 A212946 A212947

KEYWORD

nonn

AUTHOR

R. H. Hardin May 31 2012

STATUS

approved

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Last modified September 23 15:23 EDT 2021. Contains 347618 sequences. (Running on oeis4.)