A216340 Number of horizontal and antidiagonal neighbor colorings of the even squares of a 4Xn array with new integer colors introduced in row major order.

2, 10, 52, 726, 12840, 373780, 12297870, 580853761, 29562890980, 2004648246554, 142953068558998, 12954739605661928, 1216988850964527370, 140585911310155419266, 16679506383419809650408, 2374936932537133281235971

Offset: 1

Author

R. H. Hardin Sep 04 2012

Keywords

• nonn

Comments

Row 4 of A216338

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..3....x..2..x..3....x..2..x..3....x..0..x..1....x..2..x..3
..4..x..0..x....4..x..5..x....3..x..1..x....2..x..3..x....0..x..2..x
..x..5..x..3....x..3..x..0....x..3..x..1....x..2..x..1....x..0..x..4
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..19