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A211954
Number of distinct finite languages over 4-ary alphabet, whose minimum regular expression has ordinary length n.
0
6, 16, 74, 336, 1474, 6560, 28861, 128720, 578033, 2624460
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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:
A142704
A083885
A350649
*
A230942
A188570
A009352
Adjacent sequences:
A211951
A211952
A211953
*
A211955
A211956
A211957
KEYWORD
nonn
,
hard
AUTHOR
Hermann Gruber
, Apr 26 2012
STATUS
approved
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Last modified July 18 01:22 EDT 2024. Contains 374377 sequences. (Running on oeis4.)