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 A215072 Number of squarefree words of length n in a 6-ary alphabet, with new values 0..5 introduced in increasing order. 0
 1, 1, 2, 4, 12, 40, 153, 638, 2825, 12938, 60458, 285664, 1358283, 6480694, 30979999, 148249768, 709832688, 3399805736, 16286469156, 78026226228, 373832145200, 1791120945112 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Column 5 of A215075. LINKS Table of n, a(n) for n=1..22. 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....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. Sequence in context: A119430 A074034 A268952 * A326513 A268953 A268954 Adjacent sequences: A215069 A215070 A215071 * A215073 A215074 A215075 KEYWORD nonn AUTHOR R. H. Hardin, Aug 02 2012 STATUS approved

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Last modified February 28 22:27 EST 2024. Contains 370400 sequences. (Running on oeis4.)