A206352 Number of n X n 0..4 arrays with no element equal to another within two positions in the same row or column, and new values 0..4 introduced in row major order

1, 4, 230, 91518, 137375464, 780158903978

Offset

1,2

Comments

Diagonal of A206359

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A290346 A113255 A145767 * A024057 A281614 A132551

Adjacent sequences: A206349 A206350 A206351 * A206353 A206354 A206355

Keyword

nonn

Author

R. H. Hardin Feb 06 2012

Status

approved