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, 7, 181, 10311, 1016501, 152747323, 32383630189, 9192184928839, 3362887443335365, 1540205755192368507, 863047803911184565037, 580733337119861320815291, 462049013032247252827284109

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