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

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Last modified December 9 22:27 EST 2019. Contains 329880 sequences. (Running on oeis4.)