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A208583
Number of 3Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors
0
5, 159, 15215, 2946848, 960563033, 474608323506, 332296957718504, 314368829216470278, 387798647378880473938, 606687187218093234631931
OFFSET
1,1
COMMENTS
Row 3 of A208581
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..1..0....0..0..0..0....0..0..0..0....0..0..0..0
..1..1..1..0....1..0..1..0....1..1..1..0....1..1..2..0....1..2..1..1
..0..0..1..0....0..1..0..1....0..0..2..1....0..0..2..0....0..0..0..0
CROSSREFS
Sequence in context: A156486 A208170 A088694 * A197310 A266525 A085330
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 29 2012
STATUS
approved