A264939 Number of n X n arrays containing n copies of 0..n-1 with no equal horizontal neighbors and new values introduced sequentially from 0.

1, 2, 56, 184740, 137409486772, 36724170744914466520, 5395269899168064415277849230476

Offset

1,2

Comments

Diagonal of A264945.

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=4
..0..1..2..0....0..1..2..0....0..1..0..1....0..1..2..0....0..1..0..2
..3..2..0..3....0..2..3..1....2..1..3..0....3..2..1..2....2..1..2..3
..3..2..1..3....1..2..1..3....2..3..2..3....0..3..0..1....0..1..0..3
..0..1..2..1....2..3..0..3....2..3..0..1....3..1..3..2....2..3..1..3

Crossrefs

Cf. A264945.

Sequence in context: A230879 A080318 A002542 * A201217 A041391 A245783

Adjacent sequences: A264936 A264937 A264938 * A264940 A264941 A264942

Keyword

nonn

Author

R. H. Hardin, Nov 29 2015

Status

approved