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
Liam Naughton, CountingSubgroups.g
Liam Naughton and Goetz Pfeiffer, Tomlib, The GAP table of marks library
Sequence in context: A020473 A098833 A075371 * A057704 A281382 A078203
Adjacent sequences: A218945 A218946 A218947 * A218949 A218950 A218951
nonn,more
Liam Naughton, Nov 23 2012
approved