A268028 Number of 4Xn 0..2 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.

63, 3969, 250047, 13530274, 687233742, 32747526923, 1486191908610, 64725260937166, 2722665554883854, 111163751115106132, 4422667685678114786, 172002220213857351197, 6556076286013521999466, 245446300682062937711088

Offset: 1

Author

R. H. Hardin, Jan 24 2016

Keywords

• nonn

Comments

Row 4 of A268026.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Cf. A268026.