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A211944
Number of distinct finite languages over 3-ary alphabet, whose minimum regular expression has reverse Polish length 2n-1.
0
5, 15, 85, 589, 4512, 37477, 328718, 2998039
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..8.
Hermann Gruber, Jonathan Lee, and Jeffrey Shallit,
Enumerating regular expressions and their languages
, arXiv:1204.4982v1 [cs.FL], 2012.
CROSSREFS
Sequence in context:
A165625
A058820
A054363
*
A336998
A276474
A362577
Adjacent sequences:
A211941
A211942
A211943
*
A211945
A211946
A211947
KEYWORD
nonn
,
hard
AUTHOR
Hermann Gruber
, Apr 26 2012
STATUS
approved
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Last modified September 18 03:51 EDT 2024. Contains 375995 sequences. (Running on oeis4.)