A215955 Number of horizontal, vertical and diagonal neighbor colorings of the even squares of an n X 4 array with new integer colors introduced in row major order.

1, 4, 29, 313, 6150, 145563, 5219070, 208181894, 11412814314, 670592486703, 51088102234508, 4085932956830052, 407520605922011467, 42123055901071684382, 5279748839226156263229, 679936583636831702045901

Offset: 1

Author

R. H. Hardin, Aug 28 2012

Keywords

• nonn

Comments

Column 4 of A215959.

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

Links

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

Crossrefs

Cf. A215959.