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A211952
Number of distinct finite languages over 3-ary alphabet, whose minimum regular expression has ordinary length n.
0
5, 9, 33, 117, 391, 1350, 4546, 15753, 55053, 196185
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..10.
Hermann Gruber, Jonathan Lee, and Jeffrey Shallit,
Enumerating regular expressions and their languages
, arXiv:1204.4982v1 [cs.FL]
CROSSREFS
Sequence in context:
A323150
A116390
A028351
*
A098640
A239546
A083832
Adjacent sequences:
A211949
A211950
A211951
*
A211953
A211954
A211955
KEYWORD
nonn
,
hard
AUTHOR
Hermann Gruber
, Apr 26 2012
STATUS
approved
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Last modified August 29 21:13 EDT 2024. Contains 375518 sequences. (Running on oeis4.)