A218924 - OEIS

%I #21 Apr 09 2020 01:29:32

%S 1,1,1,3,18,85,657,4374,55711,530502,6603007,82736601,2032940127,

%T 32102236563

%N Number of incidences in the subgroup lattice of the alternating group.

%H Liam Naughton, <a href="http://www.maths.nuigalway.ie/~liam/CountingSubgroups.g">CountingSubgroups.g</a>.

%H Liam Naughton and Goetz Pfeiffer, <a href="http://arxiv.org/abs/1211.1911">Integer sequences realized by the subgroup pattern of the symmetric group</a>, arXiv:1211.1911 [math.GR], 2012.

%H Liam Naughton and Goetz Pfeiffer, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL16/Naughton/naughton2.html">Integer sequences realized by the subgroup pattern of the symmetric group</a>, Journal of Integer Sequences, Vol. 16, (2013), Article 13.5.8.

%H Liam Naughton and Goetz Pfeiffer, <a href="http://schmidt.nuigalway.ie/tomlib/">Tomlib, The GAP table of marks library</a>.

%Y Cf. A218921, A218922, A218923.

%K nonn,more

%O 0,4

%A _Liam Naughton_, Nov 12 2012