0,5
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
Cf. A218925.
Sequence in context: A183315 A183184 A115785 * A113835 A006349 A322203
Adjacent sequences: A218923 A218924 A218925 * A218927 A218928 A218929
nonn,more
Liam Naughton, Nov 12 2012
approved