OFFSET
1,3
COMMENTS
a(n) is also the number of (directed) Hamiltonian paths on the complete graph K_{n-1}.
LINKS
FORMULA
a(1) = 0, a(2) = 0, a(n) = (n-1)! = A104150(n) for n > 2. - Georg Fischer, Oct 21 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Eric W. Weisstein, Nov 05 2006
STATUS
approved