A230817 Number of nX6 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero

0, 12, 326, 12210, 497166, 21835516, 888633610, 37511690680, 1575024801010, 65857595528130, 2767152819316108, 115921366835256538, 4863791239252964166, 203925622348965051300, 8552837284722587592810, 358663019377259939567606

Offset

1,2

Comments

Column 6 of A230819

Links

R. H. Hardin, Table of n, a(n) for n = 1..38

Example

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

Crossrefs

Sequence in context: A365280 A080141 A153468 * A379347 A298245 A110101

Adjacent sequences: A230814 A230815 A230816 * A230818 A230819 A230820

Keyword

nonn

Author

R. H. Hardin, Oct 30 2013

Status

approved