OFFSET
2,2
REFERENCES
I. P. Goulden and D. M. Jackson, Transitive factorizations into transpositions and holomorphic mappings on the sphere, Proc. AMS., 125 (1997), 51-60.
LINKS
Harry J. Smith, Table of n, a(n) for n=2,...,100
I. P. Goulden and D. M. Jackson, Transitive factorizations into transpositions and holomorphic mappings on the sphere, Proc. AMS., 125 (1997), 51-60.
FORMULA
a(n) = (2n-2)! * n^(n-3).
EXAMPLE
a(2) = 1 because the only such factorization is (12)(12) = 1
PROG
(PARI) { for (n=2, 100, write("b060902.txt", n, " ", (2*n - 2)! * n^(n - 3)); ) } \\ Harry J. Smith, Jul 14 2009
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Ahmed Fares (ahmedfares(AT)my-deja.com), May 05 2001
EXTENSIONS
More terms from Jason Earls, May 08 2001
STATUS
approved