A215740 Number of horizontal, vertical, diagonal and antidiagonal neighbor colorings of the odd squares of an nX3 array with new integer colors introduced in row major order

1, 1, 1, 8, 22, 364, 1474, 40612, 211784, 8520924, 53617792, 2916070032, 21317896720, 1489852279864, 12342388117560, 1069484429786480, 9864419605055184, 1031932540617115200, 10458239434388496304

Offset

1,4

Comments

Column 3 of A215745

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

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

Crossrefs

Sequence in context: A183308 A362825 A117613 * A304177 A306834 A109271

Adjacent sequences: A215737 A215738 A215739 * A215741 A215742 A215743

Keyword

nonn

Author

R. H. Hardin Aug 22 2012

Status

approved