A232942 Number of n X n 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, vertically or antidiagonally, and top left element zero

1, 17, 1163, 328989, 389997789, 1950478851269, 41313911641960579, 3714942841397823613817, 1420295754221243029275852053, 2311198726771295243900465723816785

Offset

1,2

Comments

Diagonal of A232948

Links

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

Example

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

Crossrefs

Sequence in context: A130449 A130035 A032629 * A075602 A222985 A229833

Adjacent sequences: A232939 A232940 A232941 * A232943 A232944 A232945

Keyword

nonn

Author

R. H. Hardin, Dec 02 2013

Status

approved