A230619 Number of 7Xn 0..2 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero

0, 0, 0, 509978, 128706852, 35145166536, 8937075346246, 2294186499807542, 587879941920096164, 150672100573449544628, 38618667880671318212660, 9898104313860041433700268, 2536935635060076589332989468

Offset

1,4

Comments

Row 7 of A230614

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

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

Crossrefs

Sequence in context: A263958 A273987 A250057 * A176655 A123321 A258362

Adjacent sequences: A230616 A230617 A230618 * A230620 A230621 A230622

Keyword

nonn

Author

R. H. Hardin, Oct 25 2013

Status

approved