A208427 Number of n X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).

1, 14, 129, 1292, 50507, 3673572, 509698666, 148054300100, 84623199773631, 95553867727723732

Offset

1,2

Comments

Diagonal of A208434.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A208434.

Sequence in context: A038841 A240189 A021354 * A006565 A206207 A358168

Adjacent sequences: A208424 A208425 A208426 * A208428 A208429 A208430

Keyword

nonn

Author

R. H. Hardin Feb 26 2012

Status

approved