A204299 Number of nX6 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1, and 2 introduced before 3 in row major order

0, 212, 19540, 1972288, 277234340, 47309058644, 5589659640640, 870640738340900, 123996249589648356, 17750283049298827840, 2576653369311868344772, 370733913903692365171892, 53509487787359717704828880

Offset

1,2

Comments

Column 6 of A204301

Links

R. H. Hardin, Table of n, a(n) for n = 1..30

Example

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

Crossrefs

Sequence in context: A250326 A344423 A238023 * A332121 A083962 A007942

Adjacent sequences: A204296 A204297 A204298 * A204300 A204301 A204302

Keyword

nonn

Author

R. H. Hardin Jan 14 2012

Status

approved