OFFSET
1,3
REFERENCES
P. J. Cameron and P. Cara, Independent generating sets and geometries for symmetric groups, J. Algebra, Vol. 258, no. 2 (2002), 641-650.
FORMULA
For n > 4, a(n) = n^(n-2)+(n*(n-1)/2)*(n-1)^(n-3).
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 05 2002
STATUS
approved