A206644 Number of n X n 0..2 arrays with no occurrence of three equal elements in a row horizontally or vertically, and new values 0..2 introduced in row major order.

1, 14, 1625, 1414023, 7241587334, 235596375117548, 47431914936748228227

Offset

1,2

Links

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

Example

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

Crossrefs

Diagonal of A206650.

Sequence in context: A200459 A164524 A322848 * A060614 A160305 A279804

Adjacent sequences: A206641 A206642 A206643 * A206645 A206646 A206647

Keyword

nonn

Author

R. H. Hardin, Feb 11 2012

Status

approved