A216461 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of a 3Xn array with new integer colors introduced in row major order.

2, 2, 7, 15, 203, 716, 17733, 83440, 3137543, 18171918, 942426468, 6423127757, 433245459699, 3376465219485, 284615058572536, 2486327138729353, 254421641605158901, 2454996141671330713, 298288744434946125073

Offset: 1

Author

R. H. Hardin Sep 07 2012

Keywords

• nonn

Comments

Row 3 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..0
..0..x..3..x....3..x..4..x....4..x..5..x....0..x..1..x....3..x..4..x
		

Links

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