A216339 Number of horizontal and antidiagonal neighbor colorings of the even squares of a 3Xn array with new integer colors introduced in row major order.

2, 3, 15, 42, 602, 2440, 61915, 322776, 12297978, 77360796, 4044784633, 29562890886, 2004648242718, 16604827619828, 1404640885455993, 12954736337254696, 1328741141974378250, 13465808369740333664

Offset: 1

Author

R. H. Hardin Sep 04 2012

Keywords

• nonn

Comments

Row 3 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..0....x..2..x..3....x..2..x..3....x..2..x..0
..4..x..2..x....3..x..2..x....0..x..1..x....4..x..1..x....1..x..2..x
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..41