A216462 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of a 4Xn array with new integer colors introduced in row major order.

2, 5, 20, 203, 3429, 83440, 2711768, 112073062, 5691327040, 346212384169, 24737419691764, 2043836452962923, 192779435018929754, 20538493062072286871, 2449347793873500266618, 324446721789278481458200

Offset: 1

Author

R. H. Hardin Sep 07 2012

Keywords

• nonn

Comments

Row 4 of A216460

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..20