A216334 Number of horizontal and antidiagonal neighbor colorings of the even squares of an n X 4 array with new integer colors introduced in row major order.

1, 5, 42, 726, 15144, 502658, 18378580, 950376664, 52183667212, 3788883495864, 286529186194664, 27420871472654064, 2701657928740913416, 326508788572113365896, 40316833236311531705440, 5965422648942609379676752, 897057171450298448594594368, 158723597386944654236759074832

Offset: 1

Author

R. H. Hardin, Sep 04 2012

Keywords

• nonn

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..78

Crossrefs

Column 4 of A216338.