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A232249
Number of (n+1) X (n+1) 0..2 arrays with every element both >= and <= some horizontal or antidiagonal neighbor.
1
9, 421, 175431, 544777651, 12109668893083, 1861384207351560027, 2008977605538697290717011, 15204797339736917181390137180801, 806565211683665167431270425538954014249
OFFSET
1,1
COMMENTS
Diagonal of A232257.
LINKS
EXAMPLE
Some solutions for n=3
..1..1..0..2....1..1..2..1....0..0..2..0....1..1..1..2....0..0..1..1
..1..0..2..1....1..2..0..0....0..2..0..2....2..2..2..1....0..0..0..1
..1..1..0..1....2..2..1..2....2..2..2..1....2..2..0..0....1..2..2..0
..0..0..2..2....2..2..2..2....2..2..0..0....1..0..2..2....1..1..0..0
CROSSREFS
Cf. A232257.
Sequence in context: A024123 A218140 A292073 * A229843 A081481 A160376
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 21 2013
STATUS
approved