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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..18.

N. J. A. Sloane, Transforms

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: A350383 A025213 A290631 * A154565 A066562 A073877

Adjacent sequences: A116690 A116691 A116692 * A116694 A116695 A116696

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

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Last modified January 27 20:03 EST 2023. Contains 359849 sequences. (Running on oeis4.)