A215072 Number of squarefree words of length n in a 6-ary alphabet, with new values 0..5 introduced in increasing order.

1, 1, 2, 4, 12, 40, 153, 638, 2825, 12938, 60458, 285664, 1358283, 6480694, 30979999, 148249768, 709832688, 3399805736, 16286469156, 78026226228, 373832145200, 1791120945112

Offset: 1

Author

R. H. Hardin, Aug 02 2012

Keywords

• nonn

Comments

Column 5 of A215075.

Examples

			Some solutions for n=9
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....1....1....1....1....1....1....1....1....1....1....1....1....1
..2....2....2....2....2....2....2....2....2....2....0....2....0....2....2....2
..3....1....0....3....0....3....3....0....3....0....2....0....2....3....0....3
..4....3....3....0....3....4....2....3....1....3....1....3....1....4....3....4
..3....2....0....2....2....5....0....0....2....0....3....4....2....2....4....2
..5....4....2....4....3....3....2....4....4....2....0....3....0....3....1....0
..0....3....4....3....4....4....1....3....5....4....1....2....1....0....0....2
..3....4....2....5....3....1....4....5....4....0....3....0....0....2....2....3
		

Crossrefs

Cf. A215075.