1,1
Table of n, a(n) for n=1..5.
Hermann Gruber, Jonathan Lee, and Jeffrey Shallit, Enumerating regular expressions and their languages, arXiv:1204.4982v1 [cs.FL]
Sequence in context: A012754 A083568 A003121 * A176037 A057170 A200564
Adjacent sequences: A211934 A211935 A211936 * A211938 A211939 A211940
nonn
Hermann Gruber, Apr 25 2012
approved