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A211945
Number of distinct regular languages over 4-ary alphabet, whose minimum regular expression has reverse Polish length n.
1
6, 4, 26, 62, 244, 920, 3133, 13529, 48388, 208634
OFFSET
1,1
LINKS
Hermann Gruber, Jonathan Lee, and Jeffrey Shallit, Enumerating regular expressions and their languages, arXiv:1204.4982v1 [cs.FL], 2012.
CROSSREFS
Cf. A211946.
Sequence in context: A137174 A129886 A133837 * A121682 A237425 A191567
KEYWORD
nonn,more
AUTHOR
Hermann Gruber, Apr 26 2012
STATUS
approved