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

1,1

COMMENTS

Column 3 of A208581

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..40

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

Adjacent sequences:  A208575 A208576 A208577 * A208579 A208580 A208581

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 29 2012

STATUS

approved

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Last modified December 4 13:16 EST 2021. Contains 349526 sequences. (Running on oeis4.)