A230475 Number of 7Xn 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, 386, 2647098, 3045192312, 2412390974650, 2147475302085202, 1929668277796729476, 1740277427965068258778, 1566684273436028817518446

Offset

1,2

Comments

Row 7 of A230469

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A277988 A224496 A230274 * A375944 A116329 A273383

Adjacent sequences: A230472 A230473 A230474 * A230476 A230477 A230478

Keyword

nonn

Author

R. H. Hardin, Oct 20 2013

Status

approved