A232961 Number of 7Xn 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, and top left element zero

4096, 352947, 85202361, 18193384251, 4082986991091, 913176469752921, 205030957086979647, 46049854148275821783, 10347651822185274889503, 2325450833294278864661895, 522642603826819656267942471

Offset

1,1

Comments

Row 7 of A232955

Links

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

Example

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

Crossrefs

Sequence in context: A066390 A016806 A231844 * A223966 A195660 A321836

Adjacent sequences: A232958 A232959 A232960 * A232962 A232963 A232964

Keyword

nonn

Author

R. H. Hardin, Dec 02 2013

Status

approved