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A211953
Number of distinct regular languages over 4-ary alphabet, whose minimum regular expression has ordinary length n.
0
6, 20, 102, 520, 2628, 13482, 68747, 354500, 1840433
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..9.
Hermann Gruber, Jonathan Lee, and Jeffrey Shallit,
Enumerating regular expressions and their languages
, arXiv:1204.4982v1 [cs.FL]
CROSSREFS
Sequence in context:
A333048
A200538
A238118
*
A266846
A207819
A297974
Adjacent sequences:
A211950
A211951
A211952
*
A211954
A211955
A211956
KEYWORD
nonn
,
hard
AUTHOR
Hermann Gruber
, Apr 26 2012
STATUS
approved
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Last modified May 18 16:58 EDT 2024. Contains 372664 sequences. (Running on oeis4.)