The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A362766 Number of nonisomorphic sets of permutations of an n-set. 2
 2, 2, 4, 24, 711936, 11076899964874307395625695676727296 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Isomorphism is up to permutation of the elements of the n-set. a(6) has 214 decimal digits. LINKS Andrew Howroyd, Table of n, a(n) for n = 0..6 FORMULA a(n) = Sum_{k=0..n!} A362763(n,k). A050923(n) / n! <= a(n) <= A050923(n). EXAMPLE The a(2)=4 sets with permutations shown in cycle notation are: {}, {(1)(2)}, {(12)}, {(1)(2), (12)}. CROSSREFS Row sums of A362763. Cf. A050923. Sequence in context: A009541 A307969 A212672 * A176161 A006829 A154594 Adjacent sequences: A362763 A362764 A362765 * A362767 A362768 A362769 KEYWORD nonn AUTHOR Andrew Howroyd, May 03 2023 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 9 21:06 EDT 2024. Contains 375765 sequences. (Running on oeis4.)