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A215074
Number of squarefree words of length n in an 8-ary alphabet, with new values 0..7 introduced in increasing order
0
1, 1, 2, 4, 12, 40, 154, 660, 3113, 15893, 86857, 502092, 3036032, 19006591, 122119857, 799665333, 5308126648, 35576413852, 240063646519, 1627605038848
OFFSET
1,3
COMMENTS
Column 7 of A215075.
EXAMPLE
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....2....2....2....2....2....2
..3....0....1....3....1....3....3....1....3....3....0....3....1....1....3....0
..4....3....3....4....3....4....4....3....4....0....3....4....3....3....4....3
..0....1....1....5....4....5....1....0....2....2....4....5....4....0....0....4
..3....4....0....4....0....4....5....4....5....4....5....6....0....1....1....0
..1....2....4....0....2....1....3....2....0....5....1....7....5....0....0....5
..2....0....1....6....3....2....0....5....1....4....6....2....1....3....5....2
CROSSREFS
Sequence in context: A268955 A268010 A215073 * A215070 A188479 A062962
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 02 2012
STATUS
approved