A232452 Number of n X n 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally, vertically, diagonally or antidiagonally

1, 51, 8227, 12521603, 176788379233, 21136983701111465, 21913588245620717611365, 197180664173386775421578807871, 15372564935988601841476302687987335803

Offset

1,2

Comments

Diagonal of A232459

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=3
..2..2..1....2..0..0....2..2..1....2..2..1....0..1..2....2..0..1....1..1..0
..0..0..0....0..2..1....1..1..1....2..2..2....2..0..0....1..2..1....1..2..0
..1..2..1....0..1..2....2..1..2....1..2..1....1..2..2....1..0..0....2..0..2

Crossrefs

Sequence in context: A184282 A232278 A208350 * A206395 A160475 A241332

Adjacent sequences: A232449 A232450 A232451 * A232453 A232454 A232455

Keyword

nonn

Author

R. H. Hardin, Nov 24 2013

Status

approved