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A208577 Number of nX2 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
2, 12, 159, 3233, 90863, 3319375, 151329962, 8361244271, 547602710174, 41777867546601, 3661037447467531, 364246254286662678, 40745454539546524768, 5082061117905260420201, 701704324509709771589604 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A208581

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..109

EXAMPLE

Some solutions for n=4

..0..0....0..0....0..0....0..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..0....1..1....1..0....1..0

..0..0....2..1....1..1....0..1....2..0....0..1....0..1....0..1....1..0....0..1

..1..1....0..0....2..0....0..0....0..1....1..0....0..2....0..0....0..1....1..2

CROSSREFS

Sequence in context: A127182 A326222 A330552 * A012646 A177778 A180420

Adjacent sequences:  A208574 A208575 A208576 * A208578 A208579 A208580

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 29 2012

STATUS

approved

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Last modified December 1 11:38 EST 2021. Contains 349429 sequences. (Running on oeis4.)