OFFSET
1,4
COMMENTS
A transitive group is minimal provided it has no proper transitive subgroups.
LINKS
Derek Holt and Gordon Royle, A Census of Small Transitive Groups and Vertex-Transitive Graphs, arXiv:1811.09015 [math.CO], 2018.
EXAMPLE
There are two transitive groups of degree 3, A_3 and S_3, so A002106(3)=2. However, a(3)=1, because A_3 is minimal, but S_3 has proper transitive subgroups A_3 and S_2.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Danny Rorabaugh, Nov 26 2018
STATUS
approved