A268206 Number of 2Xn 0..n arrays with every repeated value in every row and column greater than the previous repeated value.

4, 81, 3600, 324900, 48441600, 10817248036, 3377332413504, 1404654302923524, 750581746192664100, 501056831514160707984, 408622467650013146382336, 399732806541644129265761569, 461983489514281294192077209856

Offset

1,1

Comments

Row 2 of A268204.

Links

R. H. Hardin, Table of n, a(n) for n = 1..26

Example

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

Crossrefs

Cf. A268204.

Sequence in context: A264197 A221251 A128911 * A337155 A268105 A068087

Adjacent sequences: A268203 A268204 A268205 * A268207 A268208 A268209

Keyword

nonn

Author

R. H. Hardin, Jan 28 2016

Status

approved