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

2, 12, 159, 3233, 90863, 3319375, 151329962, 8361244271, 547602710174, 41777867546601, 3661037447467531, 364246254286662678, 40745454539546524768, 5082061117905260420201, 701704324509709771589604

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 A330552 A326222 * A012646 A177778 A180420

Adjacent sequences: A208574 A208575 A208576 * A208578 A208579 A208580

Keyword

nonn

Author

R. H. Hardin Feb 29 2012

Status

approved