login
A116693
Number of fixed-point-free subgroups of the symmetric group S_n.
2
1, 0, 1, 2, 15, 50, 874, 3515, 94638, 634630, 18368060, 149965474, 7392944314, 61596293433, 4042125261152, 46326163964879, 4045711099761347, 47868661342996788, 6066544790946772416
OFFSET
0,4
LINKS
MATHEMATICA
A005432 = Cases[Import["https://oeis.org/A005432/b005432.txt", "Table"], {_, _}][[All, 2]];
a[n_] := Sum[(-1)^(n-k) Binomial[n, k] A005432[[k+1]], {k, 0, n}];
a /@ Range[0, Length[A005432]-1] (* Jean-François Alcover, Dec 17 2019 *)
CROSSREFS
Labeled version of A000637. Inverse binomial Transform of A005432.
Sequence in context: A025213 A362303 A290631 * A154565 A066562 A073877
KEYWORD
nonn,hard
AUTHOR
Christian G. Bower, Feb 23 2006
EXTENSIONS
More terms from inverse binomial transform of A005432 by R. J. Mathar, Mar 03 2015
STATUS
approved