A076863 n^(n-2)+(n*(n-1)/2)*(n-1)^(n-3).

1, 2, 6, 34, 285, 3171, 44023, 732740, 14220153, 315233605, 7857947691, 217541911830, 6621714803509, 219780508232663, 7899055867765455, 305601002241052936, 12662255840668015089, 559390257977596068105, 26246546675302419239635, 1303417502979112415328410

Offset

1,2

Comments

For n > 4, number of maximal independent generating sets for S_n. Compare A078103.

References

P. J. Cameron and P. Cara, Independent generating sets and geometries for symmetric groups, J. Algebra, Vol. 258, no. 2 (2002), 641-650.

Links

Table of n, a(n) for n=1..20.

Mathematica

Join[{1}, Table[n^(n-2)+(n(n-1))/2 (n-1)^(n-3), {n, 2, 20}]] (* Harvey P. Dale, Apr 26 2017 *)

Crossrefs

A000272 + A052182.

Sequence in context: A052878 A168362 A274711 * A191742 A181082 A118186

Adjacent sequences: A076860 A076861 A076862 * A076864 A076865 A076866

Keyword

nonn

Author

N. J. A. Sloane, Nov 23 2002

Status

approved