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A058822
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a(0) = 1, a(1) = 7; for n>=2 a(n) is the number of degree-n monic reducible polynomials over GF(7), i.e. a(n) = 7^n - A001693(n).
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0
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1, 7, 28, 231, 1813, 13447, 98105, 705895, 5044501, 35869911, 254229409, 1797569767, 12687856601
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Dimensions of homogeneous subspaces of shuffle algebra over 7-letter alphabet (see A058766 for 2-letter case).
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REFERENCES
| M. Lothaire, Combinatorics on words, Cambridge mathematical library, 1983, p. 126 (definition of shuffle algebra).
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CROSSREFS
| Cf. A058766.
Cf. A001693.
Sequence in context: A001554 A026664 A203296 * A054369 A198028 A203209
Adjacent sequences: A058819 A058820 A058821 * A058823 A058824 A058825
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KEYWORD
| nonn
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AUTHOR
| Claude Lenormand (claude.lenormand(AT)free.fr), Jan 04 2001
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EXTENSIONS
| Better description from Sharon Sela (sharonsela(AT)hotmail.com), Feb 19 2002
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