The On-Line Encyclopedia of Integer Sequences (OEIS)

A208560 revision #5

A208560

Number of nXn 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than one of its immediate leftward or upward or left-upward diagonal neighbors

1, 10, 1059, 600426, 1820627588, 29489112993258, 2550050797214882163, 1177059517691274455925664, 2899898779178057927709489333244, 38132339745477816025554449167624111270

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Diagonal of A208567

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..12

EXAMPLE

Some solutions for n=4

..0..0..0..1....0..0..0..0....0..0..1..2....0..0..1..2....0..1..1..0

..1..1..1..0....1..1..1..1....0..2..2..0....2..1..0..0....1..2..2..2

..0..2..2..2....2..2..2..2....2..0..0..1....1..2..1..1....0..1..0..1

..0..1..0..0....0..0..0..0....2..1..2..1....2..1..2..2....2..0..1..2

CROSSREFS

Sequence in context: A145184 A004810 A225604 * A263311 A190945 A226553

Adjacent sequences: A208557 A208558 A208559 * A208561 A208562 A208563

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Feb 28 2012

STATUS

approved