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A211947 Number of distinct regular languages over unary alphabet, whose minimum regular expression has ordinary length n. 0
3, 2, 3, 4, 5, 9, 12, 17, 25, 33 (list; graph; refs; listen; history; text; internal format)
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: A335944 A035366 A114751 * A220071 A132408 A091821

Adjacent sequences:  A211944 A211945 A211946 * A211948 A211949 A211950

KEYWORD

nonn,hard

AUTHOR

Hermann Gruber, Apr 26 2012

STATUS

approved

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Last modified September 27 07:28 EDT 2021. Contains 347673 sequences. (Running on oeis4.)