%I A143248
%S A143248 0,12,144,2880,86400,3628800,203212800,14631321600,1316818944000,
%T A143248 144850083840000,19120211066880000,2982752926433280000,
%U A143248 542861032610856960000,114000816848279961600000
%N A143248 Number of (directed) Hamiltonian circuits in the complete bipartite graph 
               K_{n,n}.
%H A143248 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               CompleteBipartiteGraph.html">BipartiteGraph</a>
%H A143248 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               HamiltonianCircuit.html">HamiltonianCircuit</a>
%F A143248 a(1) = 0, a(n) = n!(n+1)!
%F A143248 a(n)=A010790(n), n>1. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Aug 15 2008]
%Y A143248 Sequence in context: A000468 A076728 A123237 this_sequence A138444 A137886 
               A097303
%Y A143248 Adjacent sequences: A143245 A143246 A143247 this_sequence A143249 A143250 
               A143251
%K A143248 nonn
%O A143248 1,2
%A A143248 E. W. Weisstein (eric(AT)weisstein.com), Aug 01, 2008