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Search: id:A007057
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| A007057 |
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Number of words of length n in a certain language.
(Formerly M3510)
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+0
1
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| 1, 4, 16, 40, 136, 304, 880, 1768, 4936, 9112, 25216
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
R. Kemp, On the number of words in the language {w in Sigma* | w = w^R }^2, Discrete Math., 40 (1982), 225-234.
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CROSSREFS
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Sequence in context: A121318 A152133 A110477 this_sequence A056373 A018828 A114211
Adjacent sequences: A007054 A007055 A007056 this_sequence A007058 A007059 A007060
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein, R. Kemp
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