A208321 Number of nX7 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors

365, 644516, 1155714080, 2070490270512, 3709557427849168, 6646136838761770080, 11907389879137262727680, 21333585910270398554399552, 38221801163340515446621891584, 68479161927864786372249886727360

Offset

1,1

Comments

Column 7 of A208322

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A223132 A199654 A241113 * A208391 A208398 A258485

Adjacent sequences: A208318 A208319 A208320 * A208322 A208323 A208324

Keyword

nonn

Author

R. H. Hardin Feb 25 2012

Status

approved