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%I #3 Mar 30 2012 16:50:40
%S 0,1,12,151,2180,36261,688408,14750191,352961064,9345270925,
%T 271562360036,8599866305031,294969253011628,10898548778881141,
%U 431703607027230000,18254845289747040991,820907602015573913552,39124764979819837803549,1970218861127675697564604
%N n^n - (2n-1)!!.
%C Theorem: n^n > (2n-1)!! for n>1.
%D D. S. Mitrinovic, Analytic Inequalities, Springer-Verlag, 1970; p. 192, 3.1.15.
%Y Cf. A001147, A127688.
%K nonn
%O 1,3
%A _N. J. A. Sloane_, Apr 03 2007