A229840 Number of n X n 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value 2-x(i,j)

0, 15, 987, 453837, 1296261759, 23643209345079, 2745117942652795617

Offset

1,2

Comments

Diagonal of A229847

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A055413 A067408 A274713 * A102102 A196569 A019282

Adjacent sequences: A229837 A229838 A229839 * A229841 A229842 A229843

Keyword

nonn

Author

R. H. Hardin, Oct 01 2013

Status

approved