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

5, 159, 15215, 2946848, 960563033, 474608323506, 332296957718504, 314368829216470278, 387798647378880473938, 606687187218093234631931

Offset

1,1

Comments

Row 3 of A208581

Links

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

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

Adjacent sequences: A208580 A208581 A208582 * A208584 A208585 A208586

Keyword

nonn

Author

R. H. Hardin Feb 29 2012

Status

approved