A232249 Number of (n+1) X (n+1) 0..2 arrays with every element both >= and <= some horizontal or antidiagonal neighbor.

9, 421, 175431, 544777651, 12109668893083, 1861384207351560027, 2008977605538697290717011, 15204797339736917181390137180801, 806565211683665167431270425538954014249

Offset

1,1

Comments

Diagonal of A232257.

Links

R. H. Hardin, Table of n, a(n) for n = 1..11

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

Adjacent sequences: A232246 A232247 A232248 * A232250 A232251 A232252

Keyword

nonn

Author

R. H. Hardin, Nov 21 2013

Status

approved