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Search: id:A007056
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A007056 Number of words of length n in a certain language.
(Formerly M2781)
+0
1
1, 3, 9, 21, 57, 123, 279, 549, 1209, 2127, 4689 (list; graph; listen)
OFFSET

0,2

REFERENCES

R. Kemp, On the number of words in the language {w in Sigma* | w = w^R }^2, Discrete Math., 40 (1982), 225-234.

CROSSREFS

Adjacent sequences: A007053 A007054 A007055 this_sequence A007057 A007058 A007059

Sequence in context: A111209 A109755 A005254 this_sequence A026551 A060578 A004667

KEYWORD

nonn

AUTHOR

njas, Mira Bernstein, R. Kemp

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Last modified May 16 23:01 EDT 2008. Contains 139884 sequences.


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