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A211938
Number of distinct finite languages over 4-ary alphabet, whose minimum regular expression has alphabetic width n.
0
2, 8, 112, 2164, 51008, 1346924
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..6.
Hermann Gruber, Jonathan Lee, and Jeffrey Shallit,
Enumerating regular expressions and their languages
, arXiv:1204.4982v1 [cs.FL]
CROSSREFS
Sequence in context:
A362727
A012665
A317076
*
A331405
A005787
A012343
Adjacent sequences:
A211935
A211936
A211937
*
A211939
A211940
A211941
KEYWORD
nonn
,
hard
AUTHOR
Hermann Gruber
, Apr 25 2012
STATUS
approved
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Last modified September 15 16:35 EDT 2024. Contains 375938 sequences. (Running on oeis4.)