A212933 Number of 4Xn 0..n-1 arrays with no column j greater than column j-1 in all rows.

1, 255, 518320, 4041974015, 85800824609376, 4051316109991426752, 372271852759802667094256, 60525940157456181486116315391, 16213293097463939456656505907266320

Offset: 1

Author

R. H. Hardin May 31 2012

Keywords

• nonn

Comments

Row 4 of A212930

Examples

			Some solutions for n=3
..2..0..1....2..1..0....0..0..2....0..0..0....2..2..2....2..2..1....2..2..0
..0..0..2....2..1..2....0..0..2....2..0..2....1..2..1....2..0..0....0..0..2
..1..1..2....2..1..1....0..0..0....2..0..1....0..2..2....2..0..0....2..0..0
..0..0..0....0..1..1....1..2..0....0..0..0....0..0..2....2..2..2....1..0..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..16