A230472 Number of 4Xn 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero

0, 8, 1384, 76518, 3062214, 131421154, 5660619846, 245148922672, 10602405238156, 458539032665354, 19829852540702200, 857572844510153520, 37087106370781509158, 1603891953715654451316, 69362889010577734405252

Offset

1,2

Comments

Row 4 of A230469

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical recurrence of order 57

Formula

Empirical recurrence of order 57 (see link above)

Example

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

Crossrefs

Sequence in context: A001418 A123268 A088080 * A160103 A283902 A064073

Adjacent sequences: A230469 A230470 A230471 * A230473 A230474 A230475

Keyword

nonn

Author

R. H. Hardin, Oct 20 2013

Status

approved