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A211941
Number of distinct regular languages over binary alphabet, whose minimum regular expression has reverse Polish length n.
0
4, 2, 7, 13, 32, 90, 189, 580, 1347, 3978
OFFSET
1,1
LINKS
Hermann Gruber, Jonathan Lee, and Jeffrey Shallit, Enumerating regular expressions and their languages, arXiv:1204.4982v1 [cs.FL], 2012.
CROSSREFS
Sequence in context: A255140 A108167 A261690 * A050105 A367209 A348873
KEYWORD
nonn,hard
AUTHOR
Hermann Gruber, Apr 26 2012
STATUS
approved