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A208578
Number of nX3 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
1
5, 152, 15215, 3012383, 992352688, 493060277544, 346279494967526, 328147828693412793, 405140655255049613481, 634030553946045902705124, 1230184720940057735002661377, 2905785104106201330409269721974
OFFSET
1,1
COMMENTS
Column 3 of A208581
LINKS
EXAMPLE
Some solutions for n=4
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..1....0..0..0
..1..1..0....1..1..0....1..2..1....1..1..0....1..1..0....1..0..0....1..1..0
..2..0..1....2..0..1....0..0..0....0..1..0....0..2..1....0..1..0....0..1..0
..0..1..0....1..0..2....3..1..0....0..1..0....0..0..0....0..1..0....0..1..2
CROSSREFS
Sequence in context: A261822 A105230 A222768 * A322634 A108535 A265123
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 29 2012
STATUS
approved