A206961 Number of n X n 0..3 arrays avoiding the pattern z z+1 z in any row, column or nw-to-se diagonal

4, 256, 188699, 1657999936, 178334417556473, 233756297269025517833, 3726713206845504722090161857

Offset

1,1

Comments

Diagonal of A206967

Links

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

Example

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

Crossrefs

Sequence in context: A207529 A206968 A206789 * A206569 A207576 A209086

Adjacent sequences: A206958 A206959 A206960 * A206962 A206963 A206964

Keyword

nonn

Author

R. H. Hardin Feb 14 2012

Status

approved