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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
OFFSET
1,1
COMMENTS
Column 2 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..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 A330552 A326222 * A012646 A177778 A180420
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 29 2012
STATUS
approved