

A218975


Number of connected cyclic conjugacy classes of subgroups of the alternating group.


0



1, 1, 0, 1, 1, 1, 2, 1, 3, 3, 4, 2, 8, 2
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OFFSET

0,7


COMMENTS

a(n) is also the number of connected even partitions of n in the following sense. Given a partition of n, the vertices are the parts of the partition and two vertices are connected if and only if their gcd is greater than 1. We call a partition connected if the graph is connected.


LINKS

Table of n, a(n) for n=0..13.
Liam Naughton and Goetz Pfeiffer, Integer sequences realized by the subgroup pattern of the symmetric group, arXiv:1211.1911 and J. Int. Seq. 16 (2013) #13.5.8
Liam Naughton, CountingSubgroups.g
Liam Naughton and Goetz Pfeiffer, Tomlib, The GAP table of marks library


CROSSREFS

Cf. A218970
Sequence in context: A082666 A057938 A144623 * A048619 A116087 A163281
Adjacent sequences: A218972 A218973 A218974 * A218976 A218977 A218978


KEYWORD

nonn,more


AUTHOR

Liam Naughton, Nov 28 2012


STATUS

approved



