%I A124355
%S A124355 0,0,2,6,24,120,720,5040,40320,362880,3628800,39916800,479001600,
%T A124355 6227020800,87178291200,1307674368000,20922789888000,355687428096000,
%U A124355 6402373705728000,121645100408832000,2432902008176640000
%N A124355 Number of (directed) Hamiltonian cycles on the complete graph K_n.
%H A124355 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               HamiltonianCircuit.html">Hamiltonian Circuit</a>
%F A124355 a(1) = 0, a(2) = 0, a(n) = (n-1)! otherwise
%Y A124355 Cf. A000142.
%Y A124355 Sequence in context: A155456 A000142 A104150 this_sequence A133942 A159333 
               A165233
%Y A124355 Adjacent sequences: A124352 A124353 A124354 this_sequence A124356 A124357 
               A124358
%K A124355 nonn
%O A124355 1,3
%A A124355 Eric Weisstein (eric(AT)weisstein.com), Nov 05, 2006