A230804 Number of nX6 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, and upper left element zero

0, 154, 1546, 183088, 6832578, 485186602, 25669880656, 1576356652138, 90342705475634, 5358270247598784, 312733245050099786

Offset

1,2

Comments

Column 6 of A230805

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=4
..0..1..0..0..3..0....0..3..0..3..0..1....0..3..0..3..0..3....0..3..0..1..0..3
..3..2..3..1..2..1....1..2..1..2..1..2....1..2..1..2..1..2....1..2..3..2..1..2
..0..1..2..1..3..2....2..3..2..3..0..3....2..1..1..2..3..0....3..2..0..1..3..0
..3..2..3..0..0..1....3..0..1..2..1..2....3..0..0..3..2..1....0..1..0..3..2..1

Crossrefs

Sequence in context: A250626 A235107 A235100 * A200552 A160854 A159639

Adjacent sequences: A230801 A230802 A230803 * A230805 A230806 A230807

Keyword

nonn

Author

R. H. Hardin, Oct 30 2013

Status

approved