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

Author

R. H. Hardin May 31 2012

Keywords

• nonn

Comments

Row 2 of A212943

Examples

			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
		

Links

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