A215957 Number of horizontal, vertical and diagonal neighbor colorings of the even squares of an nX6 array with new integer colors introduced in row major order.

2, 34, 1534, 145563, 30312074, 9260821180, 4761748786964, 3146896493234825

Offset: 1

Author

R. H. Hardin Aug 28 2012

Keywords

• nonn

Comments

Column 6 of A215959

Examples

			Some solutions for n=4
..0..x..1..x..2..x....0..x..1..x..2..x....0..x..1..x..2..x....0..x..1..x..0..x
..x..1..x..3..x..0....x..1..x..3..x..4....x..3..x..4..x..0....x..2..x..0..x..3
..3..x..2..x..0..x....1..x..0..x..5..x....1..x..5..x..0..x....1..x..0..x..4..x
..x..4..x..5..x..6....x..5..x..1..x..3....x..0..x..3..x..6....x..3..x..5..x..6