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A007055 Number of words of length n in a certain language.
(Formerly M1124)
+0
1
1, 2, 4, 8, 16, 32, 52, 100, 160, 260, 424 (list; graph; listen)
OFFSET

0,2

REFERENCES

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.

CROSSREFS

Sequence in context: A133408 A101434 A008382 this_sequence A072207 A033860 A115909

Adjacent sequences: A007052 A007053 A007054 this_sequence A007056 A007057 A007058

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein, R. Kemp

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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