A229396 Number of n X n 0..2 arrays with top left element 0, horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and antidiagonal differences never 0.

1, 5, 44, 711, 21464, 1220881, 131393852, 26816872052, 10394515165440, 7659334578853703, 10736651986556444032, 28645789175160296213419, 145524991952628629000779856, 1408095497232794991798389383499

Offset

1,2

Comments

Diagonal of A229402.

Links

R. H. Hardin, Table of n, a(n) for n = 1..18

Example

Some solutions for n=4
..0..0..2..2....0..2..1..0....0..0..2..2....0..0..0..2....0..2..1..1
..1..0..0..0....0..2..2..1....1..1..0..2....1..1..0..2....1..0..2..2
..1..1..1..0....1..0..0..2....2..1..0..2....2..1..0..0....1..0..0..2
..2..2..1..0....1..1..0..0....2..1..1..0....0..2..1..1....1..1..0..0

Crossrefs

Cf. A229402.

Sequence in context: A336290 A214396 A252931 * A301655 A048940 A218375

Adjacent sequences: A229393 A229394 A229395 * A229397 A229398 A229399

Keyword

nonn

Author

R. H. Hardin, Sep 22 2013

Status

approved