A215844 Number of horizontal, vertical, diagonal and antidiagonal neighbor colorings of the even squares of an nX3 array with new integer colors introduced in row major order

1, 1, 4, 8, 102, 364, 8460, 40612, 1440676, 8520924, 419195864, 2916070032, 187464151920, 1489852279864, 120167989574768, 1069484429786480, 105066789765860688, 1031932540617115200, 120715131903960979168

Offset

1,3

Comments

Column 3 of A215847

Links

R. H. Hardin, Table of n, a(n) for n = 1..42

Example

Some solutions for n=4
..0..x..1....0..x..1....0..x..1....0..x..1....0..x..1....0..x..1....0..x..1
..x..2..x....x..2..x....x..2..x....x..2..x....x..2..x....x..2..x....x..2..x
..3..x..0....3..x..4....1..x..3....3..x..4....3..x..0....3..x..4....1..x..0
..x..1..x....x..1..x....x..4..x....x..5..x....x..4..x....x..0..x....x..3..x

Crossrefs

Sequence in context: A071277 A336795 A273060 * A111100 A105036 A012940

Adjacent sequences: A215841 A215842 A215843 * A215845 A215846 A215847

Keyword

nonn

Author

R. H. Hardin Aug 24 2012

Status

approved